diff --git a/.gitignore b/.gitignore
index ac46434..b538747 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,14 @@
 *.a
 *.so
 *.so.?*
+*.dll
+*.exe
 *.dylib
 *.cmake
 !/cmake/*.cmake
 *~
+*.pyc
+__pycache__
 
 # cmake files.
 /Testing
diff --git a/appveyor.yml b/appveyor.yml
new file mode 100644
index 0000000..34bdc5f
--- /dev/null
+++ b/appveyor.yml
@@ -0,0 +1,55 @@
+version: '{build}'
+
+configuration:
+  - Static Debug
+  - Static Release
+#  - Shared Debug
+#  - Shared Release
+
+platform:
+  - x86
+  - x64
+
+environment:
+  matrix:
+    - compiler: gcc-4.9.2-posix
+#    - compiler: gcc-4.8.4-posix
+#    - compiler: msvc-12-seh
+
+install:
+  # derive some extra information
+  - for /f "tokens=1-2" %%a in ("%configuration%") do (@set "linkage=%%a")
+  - for /f "tokens=1-2" %%a in ("%configuration%") do (@set "variant=%%b")
+  - if "%linkage%"=="Shared" (set shared=YES) else (set shared=NO)
+  - for /f "tokens=1-3 delims=-" %%a in ("%compiler%") do (@set "compiler_name=%%a")
+  - for /f "tokens=1-3 delims=-" %%a in ("%compiler%") do (@set "compiler_version=%%b")
+  - for /f "tokens=1-3 delims=-" %%a in ("%compiler%") do (@set "compiler_threading=%%c")
+  - if "%platform%"=="x64" (set arch=x86_64)
+  - if "%platform%"=="x86" (set arch=i686)
+  # download the specific version of MinGW
+  - if "%compiler_name%"=="gcc" (for /f %%a in ('python mingw.py --quiet --version "%compiler_version%" --arch "%arch%" --threading "%compiler_threading%" --location "C:\mingw-builds"') do @set "compiler_path=%%a")
+
+before_build:
+  # Set up mingw commands
+  - if "%compiler_name%"=="gcc" (set "generator=MinGW Makefiles")
+  - if "%compiler_name%"=="gcc" (set "build=mingw32-make -j4")
+  - if "%compiler_name%"=="gcc" (set "test=mingw32-make CTEST_OUTPUT_ON_FAILURE=1 test")
+  # msvc specific commands
+  # TODO :)
+  # add the compiler path if needed
+  - if not "%compiler_path%"=="" (set "PATH=%PATH%;%compiler_path%")
+  # git bash conflicts with MinGW makefiles
+  - if "%generator%"=="MinGW Makefiles" (set "PATH=%PATH:C:\Program Files (x86)\Git\bin=%")
+
+build_script:
+  - cmake -G "%generator%" "-DCMAKE_BUILD_TYPE=%variant%" "-DBENCHMARK_ENABLE_SHARED=%shared%"
+  - cmd /c "%build%"
+
+test_script:
+  - cmd /c "%test%"
+
+matrix:
+  fast_finish: true
+
+cache:
+  - C:\mingw-builds
diff --git a/mingw.py b/mingw.py
new file mode 100644
index 0000000..706ad55
--- /dev/null
+++ b/mingw.py
@@ -0,0 +1,320 @@
+#! /usr/bin/env python
+# encoding: utf-8
+
+import argparse
+import errno
+import logging
+import os
+import platform
+import re
+import sys
+import subprocess
+import tempfile
+
+try:
+    import winreg
+except ImportError:
+    import _winreg as winreg
+try:
+    import urllib.request as request
+except ImportError:
+    import urllib as request
+try:
+    import urllib.parse as parse
+except ImportError:
+    import urlparse as parse
+
+class EmptyLogger(object):
+    '''
+    Provides an implementation that performs no logging
+    '''
+    def debug(self, *k, **kw):
+        pass
+    def info(self, *k, **kw):
+        pass
+    def warn(self, *k, **kw):
+        pass
+    def error(self, *k, **kw):
+        pass
+    def critical(self, *k, **kw):
+        pass
+    def setLevel(self, *k, **kw):
+        pass
+
+urls = (
+    'http://downloads.sourceforge.net/project/mingw-w64/Toolchains%20'
+        'targetting%20Win32/Personal%20Builds/mingw-builds/installer/'
+        'repository.txt',
+    'http://downloads.sourceforge.net/project/mingwbuilds/host-windows/'
+        'repository.txt'
+)
+'''
+A list of mingw-build repositories
+'''
+
+def repository(urls = urls, log = EmptyLogger()):
+    '''
+    Downloads and parse mingw-build repository files and parses them
+    '''
+    log.info('getting mingw-builds repository')
+    versions = {}
+    re_sourceforge = re.compile(r'http://sourceforge.net/projects/([^/]+)/files')
+    re_sub = r'http://downloads.sourceforge.net/project/\1'
+    for url in urls:
+        log.debug(' - requesting: %s', url)
+        socket = request.urlopen(url)
+        repo = socket.read()
+        if not isinstance(repo, str):
+            repo = repo.decode();
+        socket.close()
+        for entry in repo.split('\n')[:-1]:
+            value = entry.split('|')
+            version = tuple([int(n) for n in value[0].strip().split('.')])
+            version = versions.setdefault(version, {})
+            arch = value[1].strip()
+            if arch == 'x32':
+                arch = 'i686'
+            elif arch == 'x64':
+                arch = 'x86_64'
+            arch = version.setdefault(arch, {})
+            threading = arch.setdefault(value[2].strip(), {})
+            exceptions = threading.setdefault(value[3].strip(), {})
+            revision = exceptions.setdefault(int(value[4].strip()[3:]),
+                re_sourceforge.sub(re_sub, value[5].strip()))
+    return versions
+
+def find_in_path(file, path=None):
+    '''
+    Attempts to find an executable in the path
+    '''
+    if platform.system() == 'Windows':
+        file += '.exe'
+    if path is None:
+        path = os.environ.get('PATH', '')
+    if type(path) is type(''):
+        path = path.split(os.pathsep)
+    return list(filter(os.path.exists,
+        map(lambda dir, file=file: os.path.join(dir, file), path)))
+
+def find_7zip(log = EmptyLogger()):
+    '''
+    Attempts to find 7zip for unpacking the mingw-build archives
+    '''
+    log.info('finding 7zip')
+    path = find_in_path('7z')
+    if not path:
+        key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, r'SOFTWARE\7-Zip')
+        path, _ = winreg.QueryValueEx(key, 'Path')
+        path = [os.path.join(path, '7z.exe')]
+    log.debug('found \'%s\'', path[0])
+    return path[0]
+
+find_7zip()
+
+def unpack(archive, location, log = EmptyLogger()):
+    '''
+    Unpacks a mingw-builds archive
+    '''
+    sevenzip = find_7zip(log)
+    log.info('unpacking %s', os.path.basename(archive))
+    cmd = [sevenzip, 'x', archive, '-o' + location, '-y']
+    log.debug(' - %r', cmd)
+    with open(os.devnull, 'w') as devnull:
+        subprocess.check_call(cmd, stdout = devnull)
+
+def download(url, location, log = EmptyLogger()):
+    '''
+    Downloads and unpacks a mingw-builds archive
+    '''
+    log.info('downloading MinGW')
+    log.debug(' - url: %s', url)
+    log.debug(' - location: %s', location)
+
+    re_content = re.compile(r'attachment;[ \t]*filename=(")?([^"]*)(")?[\r\n]*')
+
+    stream = request.urlopen(url)
+    try:
+        content = stream.getheader('Content-Disposition') or ''
+    except AttributeError:
+        content = stream.headers.getheader('Content-Disposition') or ''
+    matches = re_content.match(content)
+    if matches:
+        filename = matches.group(2)
+    else:
+        parsed = parse.urlparse(stream.geturl())
+        filename = os.path.basename(parsed.path)
+
+    try:
+        os.makedirs(location)
+    except OSError as e:
+        if e.errno == errno.EEXIST and os.path.isdir(location):
+            pass
+        else:
+            raise
+
+    archive = os.path.join(location, filename)
+    with open(archive, 'wb') as out:
+        while True:
+            buf = stream.read(1024)
+            if not buf:
+                break
+            out.write(buf)
+    unpack(archive, location, log = log)
+    os.remove(archive)
+
+    possible = os.path.join(location, 'mingw64')
+    if not os.path.exists(possible):
+        possible = os.path.join(location, 'mingw32')
+        if not os.path.exists(possible):
+            raise ValueError('Failed to find unpacked MinGW: ' + possible)
+    return possible
+
+def root(location = None, arch = None, version = None, threading = None,
+        exceptions = None, revision = None, log = EmptyLogger()):
+    '''
+    Returns the root folder of a specific version of the mingw-builds variant
+    of gcc. Will download the compiler if needed
+    '''
+
+    # Get the repository if we don't have all the information
+    if not (arch and version and threading and exceptions and revision):
+        versions = repository(log = log)
+
+    # Determine some defaults
+    version = version or max(versions.keys())
+    if not arch:
+        arch = platform.machine().lower()
+        if arch == 'x86':
+            arch = 'i686'
+        elif arch == 'amd64':
+            arch = 'x86_64'
+    if not threading:
+        keys = versions[version][arch].keys()
+        if 'posix' in keys:
+            threading = 'posix'
+        elif 'win32' in keys:
+            threading = 'win32'
+        else:
+            threading = keys[0]
+    if not exceptions:
+        keys = versions[version][arch][threading].keys()
+        if 'seh' in keys:
+            exceptions = 'seh'
+        elif 'sjlj' in keys:
+            exceptions = 'sjlj'
+        else:
+            exceptions = keys[0]
+    if revision == None:
+        revision = max(versions[version][arch][threading][exceptions].keys())
+    if not location:
+        location = os.path.join(tempfile.gettempdir(), 'mingw-builds')
+
+    # Get the download url
+    url = versions[version][arch][threading][exceptions][revision]
+
+    # Tell the user whatzzup
+    log.info('finding MinGW %s', '.'.join(str(v) for v in version))
+    log.debug(' - arch: %s', arch)
+    log.debug(' - threading: %s', threading)
+    log.debug(' - exceptions: %s', exceptions)
+    log.debug(' - revision: %s', revision)
+    log.debug(' - url: %s', url)
+
+    # Store each specific revision differently
+    slug = '{version}-{arch}-{threading}-{exceptions}-rev{revision}'
+    slug = slug.format(
+        version = '.'.join(str(v) for v in version),
+        arch = arch,
+        threading = threading,
+        exceptions = exceptions,
+        revision = revision
+    )
+    if arch == 'x86_64':
+        root_dir = os.path.join(location, slug, 'mingw64')
+    elif arch == 'i686':
+        root_dir = os.path.join(location, slug, 'mingw32')
+    else:
+        raise ValueError('Unknown MinGW arch: ' + arch)
+
+    # Download if needed
+    if not os.path.exists(root_dir):
+        downloaded = download(url, os.path.join(location, slug), log = log)
+        if downloaded != root_dir:
+            raise ValueError('The location of mingw did not match\n%s\n%s'
+                % (downloaded, root_dir))
+
+    return root_dir
+
+def str2ver(string):
+    '''
+    Converts a version string into a tuple
+    '''
+    try:
+        version = tuple(int(v) for v in string.split('.'))
+        if len(version) is not 3:
+            raise ValueError()
+    except ValueError:
+        raise argparse.ArgumentTypeError(
+            'please provide a three digit version string')
+    return version
+
+def main():
+    '''
+    Invoked when the script is run directly by the python interpreter
+    '''
+    parser = argparse.ArgumentParser(
+        description = 'Downloads a specific version of MinGW',
+        formatter_class = argparse.ArgumentDefaultsHelpFormatter
+    )
+    parser.add_argument('--location',
+        help = 'the location to download the compiler to',
+        default = os.path.join(tempfile.gettempdir(), 'mingw-builds'))
+    parser.add_argument('--arch', required = True, choices = ['i686', 'x86_64'],
+        help = 'the target MinGW architecture string')
+    parser.add_argument('--version', type = str2ver,
+        help = 'the version of GCC to download')
+    parser.add_argument('--threading', choices = ['posix', 'win32'],
+        help = 'the threading type of the compiler')
+    parser.add_argument('--exceptions', choices = ['sjlj', 'seh', 'dwarf'],
+        help = 'the method to throw exceptions')
+    parser.add_argument('--revision', type=int,
+        help = 'the revision of the MinGW release')
+    group = parser.add_mutually_exclusive_group()
+    group.add_argument('-v', '--verbose', action='store_true',
+        help='increase the script output verbosity')
+    group.add_argument('-q', '--quiet', action='store_true',
+        help='only print errors and warning')
+    args = parser.parse_args()
+
+    # Create the logger
+    logger = logging.getLogger('mingw')
+    handler = logging.StreamHandler()
+    formatter = logging.Formatter('%(message)s')
+    handler.setFormatter(formatter)
+    logger.addHandler(handler)
+    logger.setLevel(logging.INFO)
+    if args.quiet:
+        logger.setLevel(logging.WARN)
+    if args.verbose:
+        logger.setLevel(logging.DEBUG)
+
+    # Get MinGW
+    root_dir = root(location = args.location, arch = args.arch,
+        version = args.version, threading = args.threading,
+        exceptions = args.exceptions, revision = args.revision,
+        log = logger)
+
+    sys.stdout.write('%s\n' % os.path.join(root_dir, 'bin'))
+
+if __name__ == '__main__':
+    try:
+        main()
+    except IOError as e:
+        sys.stderr.write('IO error: %s\n' % e)
+        sys.exit(1)
+    except OSError as e:
+        sys.stderr.write('OS error: %s\n' % e)
+        sys.exit(1)
+    except KeyboardInterrupt as e:
+        sys.stderr.write('Killed\n')
+        sys.exit(1)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 40cd9ff..818e6d5 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -32,6 +32,11 @@
   SOVERSION ${GENERIC_LIB_SOVERSION}
   )
 
+# We need extra libraries on Windows
+if(${CMAKE_SYSTEM_NAME} MATCHES "Windows")
+  target_link_libraries(benchmark Shlwapi)
+endif()
+
 # Install target (will install the library to specified CMAKE_INSTALL_PREFIX variable)
 install(
   TARGETS benchmark
diff --git a/src/benchmark.cc b/src/benchmark.cc
index 64df38a..481a179 100644
--- a/src/benchmark.cc
+++ b/src/benchmark.cc
@@ -13,9 +13,12 @@
 // limitations under the License.
 
 #include "benchmark/benchmark.h"
+#include "internal_macros.h"
 
 #include <sys/time.h>
+#ifndef OS_WINDOWS
 #include <sys/resource.h>
+#endif
 #include <unistd.h>
 
 #include <cstdlib>
diff --git a/src/colorprint.cc b/src/colorprint.cc
index d240a0c..923bc87 100644
--- a/src/colorprint.cc
+++ b/src/colorprint.cc
@@ -19,6 +19,10 @@
 #include "commandlineflags.h"
 #include "internal_macros.h"
 
+#ifdef OS_WINDOWS
+#include <Windows.h>
+#endif
+
 DECLARE_bool(color_print);
 
 namespace benchmark {
diff --git a/src/sleep.cc b/src/sleep.cc
index 4dfb4d9..0d78a53 100644
--- a/src/sleep.cc
+++ b/src/sleep.cc
@@ -19,10 +19,14 @@
 
 #include "internal_macros.h"
 
+#ifdef OS_WINDOWS
+#include <Windows.h>
+#endif
+
 namespace benchmark {
 #ifdef OS_WINDOWS
-// Window's _sleep takes milliseconds argument.
-void SleepForMilliseconds(int milliseconds) { _sleep(milliseconds); }
+// Window's Sleep takes milliseconds argument.
+void SleepForMilliseconds(int milliseconds) { Sleep(milliseconds); }
 void SleepForSeconds(double seconds) {
   SleepForMilliseconds(static_cast<int>(kNumMillisPerSecond * seconds));
 }
diff --git a/src/sysinfo.cc b/src/sysinfo.cc
index c820c0a..4535586 100644
--- a/src/sysinfo.cc
+++ b/src/sysinfo.cc
@@ -13,13 +13,19 @@
 // limitations under the License.
 
 #include "sysinfo.h"
+#include "internal_macros.h"
 
+#ifdef OS_WINDOWS
+#include <Shlwapi.h>
+#include <Windows.h>
+#else
 #include <fcntl.h>
 #include <sys/resource.h>
 #include <sys/types.h> // this header must be included before 'sys/sysctl.h' to avoid compilation error on FreeBSD
 #include <sys/sysctl.h>
 #include <sys/time.h>
 #include <unistd.h>
+#endif
 
 #include <cerrno>
 #include <cstdio>
@@ -227,7 +233,6 @@
 // TODO: also figure out cpuinfo_num_cpus
 
 #elif defined OS_WINDOWS
-#pragma comment(lib, "shlwapi.lib")  // for SHGetValue()
   // In NT, read MHz from the registry. If we fail to do so or we're in win9x
   // then make a crude estimate.
   OSVERSIONINFO os;
@@ -238,7 +243,7 @@
           SHGetValueA(HKEY_LOCAL_MACHINE,
                       "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0",
                       "~MHz", nullptr, &data, &data_size)))
-    cpuinfo_cycles_per_second = (int64)data * (int64)(1000 * 1000);  // was mhz
+    cpuinfo_cycles_per_second = (int64_t)data * (int64_t)(1000 * 1000);  // was mhz
   else
     cpuinfo_cycles_per_second = EstimateCyclesPerSecond();
 // TODO: also figure out cpuinfo_num_cpus
@@ -274,9 +279,9 @@
 }
 }  // end namespace
 
-#ifndef OS_WINDOWS
 // getrusage() based implementation of MyCPUUsage
 static double MyCPUUsageRUsage() {
+#ifndef OS_WINDOWS
   struct rusage ru;
   if (getrusage(RUSAGE_SELF, &ru) == 0) {
     return (static_cast<double>(ru.ru_utime.tv_sec) +
@@ -286,8 +291,25 @@
   } else {
     return 0.0;
   }
+#else
+  HANDLE proc = GetCurrentProcess();
+  FILETIME creation_time;
+  FILETIME exit_time;
+  FILETIME kernel_time;
+  FILETIME user_time;
+  ULARGE_INTEGER kernel;
+  ULARGE_INTEGER user;
+  GetProcessTimes(proc, &creation_time, &exit_time, &kernel_time, &user_time);
+  kernel.HighPart = kernel_time.dwHighDateTime;
+  kernel.LowPart = kernel_time.dwLowDateTime;
+  user.HighPart = user_time.dwHighDateTime;
+  user.LowPart = user_time.dwLowDateTime;
+  return (static_cast<double>(kernel.QuadPart) +
+          static_cast<double>(user.QuadPart)) / 1.0E-7;
+#endif  // OS_WINDOWS
 }
 
+#ifndef OS_WINDOWS
 static bool MyCPUUsageCPUTimeNsLocked(double* cputime) {
   static int cputime_fd = -1;
   if (cputime_fd == -1) {
@@ -313,8 +335,10 @@
   *cputime = static_cast<double>(result) / 1e9;
   return true;
 }
+#endif  // OS_WINDOWS
 
 double MyCPUUsage() {
+#ifndef OS_WINDOWS
   {
     std::lock_guard<std::mutex> l(cputimens_mutex);
     static bool use_cputime_ns = true;
@@ -328,10 +352,12 @@
       use_cputime_ns = false;
     }
   }
+#endif  // OS_WINDOWS
   return MyCPUUsageRUsage();
 }
 
 double ChildrenCPUUsage() {
+#ifndef OS_WINDOWS
   struct rusage ru;
   if (getrusage(RUSAGE_CHILDREN, &ru) == 0) {
     return (static_cast<double>(ru.ru_utime.tv_sec) +
@@ -341,8 +367,11 @@
   } else {
     return 0.0;
   }
-}
+#else
+  // TODO: Not sure what this even means on Windows
+  return 0.0;
 #endif  // OS_WINDOWS
+}
 
 double CyclesPerSecond(void) {
   std::call_once(cpuinfo_init, InitializeSystemInfo);