diff --git a/Python/pytime.c b/Python/pytime.c
index a8460c6..cdaa22e 100644
--- a/Python/pytime.c
+++ b/Python/pytime.c
@@ -7,10 +7,6 @@
 #include <mach/mach_time.h>   /* mach_absolute_time(), mach_timebase_info() */
 #endif
 
-#ifdef MS_WINDOWS
-static OSVERSIONINFOEX winver;
-#endif
-
 static int
 pygettimeofday(_PyTime_timeval *tp, _Py_clock_info_t *info, int raise)
 {
@@ -124,41 +120,11 @@
     static _PyTime_timeval last = {0, -1};
 #endif
 #if defined(MS_WINDOWS)
-    static ULONGLONG (*GetTickCount64) (void) = NULL;
-    static ULONGLONG (CALLBACK *Py_GetTickCount64)(void);
-    static int has_gettickcount64 = -1;
     ULONGLONG result;
 
     assert(info == NULL || raise);
 
-    if (has_gettickcount64 == -1) {
-        /* GetTickCount64() was added to Windows Vista */
-        has_gettickcount64 = (winver.dwMajorVersion >= 6);
-        if (has_gettickcount64) {
-            HINSTANCE hKernel32;
-            hKernel32 = GetModuleHandleW(L"KERNEL32");
-            *(FARPROC*)&Py_GetTickCount64 = GetProcAddress(hKernel32,
-                                                           "GetTickCount64");
-            assert(Py_GetTickCount64 != NULL);
-        }
-    }
-
-    if (has_gettickcount64) {
-        result = Py_GetTickCount64();
-    }
-    else {
-        static DWORD last_ticks = 0;
-        static DWORD n_overflow = 0;
-        DWORD ticks;
-
-        ticks = GetTickCount();
-        if (ticks < last_ticks)
-            n_overflow++;
-        last_ticks = ticks;
-
-        result = (ULONGLONG)n_overflow << 32;
-        result += ticks;
-    }
+    result = GetTickCount64();
 
     tp->tv_sec = result / 1000;
     tp->tv_usec = (result % 1000) * 1000;
@@ -166,10 +132,7 @@
     if (info) {
         DWORD timeAdjustment, timeIncrement;
         BOOL isTimeAdjustmentDisabled, ok;
-        if (has_gettickcount64)
-            info->implementation = "GetTickCount64()";
-        else
-            info->implementation = "GetTickCount()";
+        info->implementation = "GetTickCount64()";
         info->monotonic = 1;
         ok = GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement,
                                      &isTimeAdjustmentDisabled);
@@ -409,14 +372,6 @@
 {
     _PyTime_timeval tv;
 
-#ifdef MS_WINDOWS
-    winver.dwOSVersionInfoSize = sizeof(winver);
-    if (!GetVersionEx((OSVERSIONINFO*)&winver)) {
-        PyErr_SetFromWindowsErr(0);
-        return -1;
-    }
-#endif
-
     /* ensure that the system clock works */
     if (_PyTime_gettimeofday_info(&tv, NULL) < 0)
         return -1;
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 292830b..471389c 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -772,6 +772,12 @@
                                  via indexing, the rest are name only */
 };
 
+/* Disable deprecation warnings about GetVersionEx as the result is
+   being passed straight through to the caller, who is responsible for
+   using it correctly. */
+#pragma warning(push)
+#pragma warning(disable:4996)
+
 static PyObject *
 sys_getwindowsversion(PyObject *self)
 {
@@ -803,6 +809,8 @@
     return version;
 }
 
+#pragma warning(pop)
+
 #endif /* MS_WINDOWS */
 
 #ifdef HAVE_DLOPEN