A quick search of Google, using the error message you've received, comes up with a number of suggestions, including the link below:

http://answers.microsoft.com/en-us/windows/forum/windows_vista-desktop/desktop-backgroud-feature-disable/e2ef6c2b-794e-4523-816d-54290ad09534

And because this is frequently caused by malware, please download, install, update, then run full system scans with BOTH of the free malware scanners in the links below:

Malwarebytes
http://fileforum.betanews.com/detail/Malwarebytes-AntiMalware/1186760019/1

SuperAntispyware.
http://www.superantispyware.com/SuperAntispyware

Hope this helps.

Grif