dll error when after windows opens

Hi had a virus and my avg anti virus killed it and now after windows opens and desktop appears I get a rundll error box which says

Error loading c:\windows\system32\ujwaxmuq.dll. The specified module could not be found.

I tried to restore the file from the virus vault but to no result.

I searched for the file on the net and its not found.

Can anyone please give me instructions on how to resolve this problem?

Thanks
Bruce