I advice you to do a regclean with
TweakNow RegCleaner Standard. This program is free.
Also do ad/spyware scans with
Ad-Aware SE Personal Edition 1.06 and
Spybot - Search & Destroy 1.4. These programs are also free.
If you could take a screenshot of the errormessage and post it here it might help us a lil further.