Disable GPU on windows 7

https://github.com/cefsharp/CefSharp/issues/1634

CefSharp.MinimalExample.OffScreen/Program.cs

@@ -24,6 +24,14 @@ namespace CefSharp.MinimalExample.OffScreen
 
             var settings = new CefSettings();
 
+            var osVersion = Environment.OSVersion;
+            //Disable GPU for Windows 7
+            if (osVersion.Version.Major == 6 && osVersion.Version.Minor == 1)
+            {
+                // Disable GPU in WPF and Offscreen examples until #1634 has been resolved
+                settings.CefCommandLineArgs.Add("disable-gpu", "1");
+            }
+
             //Perform dependency check to make sure all relevant resources are in our output directory.
             Cef.Initialize(settings, shutdownOnProcessExit: false, performDependencyCheck: true);