Quoting Frankief, reply 16Just a thought, if you have previously patched your uxtheme.dll, you need to undo that patch before WB's will work properly.
I have not patched version, and officially purchased.
Detsle, Frankief was referring to other customizing software like msstyles. That software alters system files UXThememes.dll .
You might want to try to run sfc /scannow in Administrator mode (type in search box cmd then right click on that and 'Run as Administrator') to return your Windows system files to the official, correct version of Windows 7.
Then reboot, and try seeing if that helped.