1. Run your Windows Experience Index.
If this does not straighten things out,
2. Start Menu> cmd > right click on the icon and 'run as administrator' > type in sfc /scannow
Let it run. Should repair any corrupted system files.
Apply the default Aero Theme, if ok, try other blinds if ok, don't do the following. If not ok continue with:
3. Uninstall Windowblinds and clean registry (with CCleaner) and reboot.
Reinstall Windowblinds reboot.
Let us know if this solved the problem (for Windowblinds).