--- a/widget/src/windows/GfxInfo.cpp
+++ b/widget/src/windows/GfxInfo.cpp
@@ -32,16 +32,17 @@
  * decision by deleting the provisions above and replace them with the notice
  * and other provisions required by the GPL or the LGPL. If you do not delete
  * the provisions above, a recipient may use your version of this file under
  * the terms of any one of the MPL, the GPL or the LGPL.
  *
  * ***** END LICENSE BLOCK ***** */
 
 #include <windows.h>
+#include <setupapi.h>
 #include "gfxWindowsPlatform.h"
 #include "GfxInfo.h"
 #include "GfxInfoWebGL.h"
 #include "nsUnicharUtils.h"
 #include "nsPrintfCString.h"
 #include "mozilla/FunctionTimer.h"
 #include "prenv.h"
 #include "prprf.h"
@@ -175,16 +176,41 @@ static nsresult GetKeyValue(const WCHAR*
 static void normalizeDriverId(nsString& driverid) {
   ToUpperCase(driverid);
   PRInt32 rev = driverid.Find(NS_LITERAL_CSTRING("&REV_"));
   if (rev != -1) {
     driverid.Cut(rev, driverid.Length());
   }
 }
 
+// Setup API functions
+typedef HDEVINFO (WINAPI*SetupDiGetClassDevsWFunc)(
+  CONST GUID *ClassGuid,
+  PCWSTR Enumerator,
+  HWND hwndParent,
+  DWORD Flags
+);
+typedef BOOL (WINAPI*SetupDiEnumDeviceInfoFunc)(
+  HDEVINFO DeviceInfoSet,
+  DWORD MemberIndex,
+  PSP_DEVINFO_DATA DeviceInfoData
+);
+typedef BOOL (WINAPI*SetupDiGetDeviceRegistryPropertyWFunc)(
+  HDEVINFO DeviceInfoSet,
+  PSP_DEVINFO_DATA DeviceInfoData,
+  DWORD Property,
+  PDWORD PropertyRegDataType,
+  PBYTE PropertyBuffer,
+  DWORD PropertyBufferSize,
+  PDWORD RequiredSize
+);
+typedef BOOL (WINAPI*SetupDiDestroyDeviceInfoListFunc)(
+  HDEVINFO DeviceInfoSet
+);
+
 
 
 /* Other interesting places for info:
  *   IDXGIAdapter::GetDesc()
  *   IDirectDraw7::GetAvailableVidMem()
  *   e->GetAvailableTextureMem()
  * */
 
@@ -227,61 +253,84 @@ GfxInfo::Init()
 
   // chop off DEVICE_KEY_PREFIX
   mDeviceKey = displayDevice.DeviceKey + NS_ARRAY_LENGTH(DEVICE_KEY_PREFIX)-1;
 
   mDeviceID = displayDevice.DeviceID;
   mDeviceString = displayDevice.DeviceString;
 
 
-  HKEY key, subkey;
-  LONG result, enumresult;
-  DWORD index = 0;
-  WCHAR subkeyname[64];
-  WCHAR value[128];
-  DWORD dwcbData = sizeof(subkeyname);
+  HMODULE setupapi = LoadLibraryW(L"setupapi.dll");
+
+  if (setupapi) {
+    SetupDiGetClassDevsWFunc setupGetClassDevs = (SetupDiGetClassDevsWFunc)
+      GetProcAddress(setupapi, "SetupDiGetClassDevsW");
+    SetupDiEnumDeviceInfoFunc setupEnumDeviceInfo = (SetupDiEnumDeviceInfoFunc)
+      GetProcAddress(setupapi, "SetupDiEnumDeviceInfo");
+    SetupDiGetDeviceRegistryPropertyWFunc setupGetDeviceRegistryProperty = (SetupDiGetDeviceRegistryPropertyWFunc)
+      GetProcAddress(setupapi, "SetupDiGetDeviceRegistryPropertyW");
+    SetupDiDestroyDeviceInfoListFunc setupDestroyDeviceInfoList = (SetupDiDestroyDeviceInfoListFunc)
+      GetProcAddress(setupapi, "SetupDiDestroyDeviceInfoList");
 
-  // "{4D36E968-E325-11CE-BFC1-08002BE10318}" is the display class
-  result = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
-                        L"System\\CurrentControlSet\\Control\\Class\\{4D36E968-E325-11CE-BFC1-08002BE10318}", 
-                        0, KEY_QUERY_VALUE | KEY_ENUMERATE_SUB_KEYS, &key);
-  if (result != ERROR_SUCCESS) {
-    return rv;
-  }
+    if (setupGetClassDevs &&
+        setupEnumDeviceInfo &&
+        setupGetDeviceRegistryProperty &&
+        setupDestroyDeviceInfoList) {
+      /* create a device information set composed of the current display device */
+      HDEVINFO devinfo = setupGetClassDevs(NULL,
+                                           PromiseFlatString(mDeviceID).get(),
+                                           NULL,
+                                           DIGCF_PRESENT | DIGCF_PROFILE | DIGCF_ALLCLASSES);
 
-  nsAutoString wantedDriverId(mDeviceID);
-  normalizeDriverId(wantedDriverId);
+      if (devinfo != INVALID_HANDLE_VALUE) {
+        HKEY key;
+        LONG result;
+        WCHAR value[255];
+        DWORD dwcbData;
+        SP_DEVINFO_DATA devinfoData;
+        DWORD memberIndex = 0;
 
-  while ((enumresult = RegEnumKeyExW(key, index, subkeyname, &dwcbData, NULL, NULL, NULL, NULL)) != ERROR_NO_MORE_ITEMS) {
-    result = RegOpenKeyExW(key, subkeyname, 0, KEY_QUERY_VALUE, &subkey);
-    if (result == ERROR_SUCCESS) {
-      dwcbData = sizeof(value);
-      result = RegQueryValueExW(subkey, L"MatchingDeviceId", NULL, NULL, (LPBYTE)value, &dwcbData);
-      if (result == ERROR_SUCCESS) {
-        nsAutoString matchingDeviceId(value);
-        normalizeDriverId(matchingDeviceId);
-        if (wantedDriverId.Find(matchingDeviceId) > -1) {
-          /* we've found the driver we're looking for */
-          result = RegQueryValueExW(subkey, L"DriverVersion", NULL, NULL, (LPBYTE)value, &dwcbData);
-          if (result == ERROR_SUCCESS)
-            mDriverVersion = value;
-          result = RegQueryValueExW(subkey, L"DriverDate", NULL, NULL, (LPBYTE)value, &dwcbData);
-          if (result == ERROR_SUCCESS)
-            mDriverDate = value;
-          break;
+        devinfoData.cbSize = sizeof(devinfoData);
+        NS_NAMED_LITERAL_STRING(driverKeyPre, "System\\CurrentControlSet\\Control\\Class\\");
+        /* enumerate device information elements in the device information set */
+        while (setupEnumDeviceInfo(devinfo, memberIndex++, &devinfoData)) {
+          /* get a string that identifies the device's driver key */
+          if (setupGetDeviceRegistryProperty(devinfo,
+                                             &devinfoData,
+                                             SPDRP_DRIVER,
+                                             NULL,
+                                             (PBYTE)value,
+                                             sizeof(value),
+                                             NULL)) {
+            nsAutoString driverKey(driverKeyPre);
+            driverKey += value;
+            result = RegOpenKeyExW(HKEY_LOCAL_MACHINE, driverKey.BeginReading(), 0, KEY_QUERY_VALUE, &key);
+            if (result == ERROR_SUCCESS) {
+              /* we've found the driver we're looking for */
+              dwcbData = sizeof(value);
+              result = RegQueryValueExW(key, L"DriverVersion", NULL, NULL, (LPBYTE)value, &dwcbData);
+              if (result == ERROR_SUCCESS)
+                mDriverVersion = value;
+              dwcbData = sizeof(value);
+              result = RegQueryValueExW(key, L"DriverDate", NULL, NULL, (LPBYTE)value, &dwcbData);
+              if (result == ERROR_SUCCESS)
+                mDriverDate = value;
+              RegCloseKey(key);
+              break;
+            }
+          }
         }
+
+        setupDestroyDeviceInfoList(devinfo);
       }
-      RegCloseKey(subkey);
     }
-    index++;
-    dwcbData = sizeof(subkeyname);
+
+    FreeLibrary(setupapi);
   }
 
-  RegCloseKey(key);
-
   const char *spoofedDriverVersionString = PR_GetEnv("MOZ_GFX_SPOOF_DRIVER_VERSION");
   if (spoofedDriverVersionString) {
     mDriverVersion.AssignASCII(spoofedDriverVersionString);
   }
 
   const char *spoofedVendor = PR_GetEnv("MOZ_GFX_SPOOF_VENDOR_ID");
   if (spoofedVendor) {
      PR_sscanf(spoofedVendor, "%x", &mAdapterVendorID);