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Welcome to the forums, iblis.
Have you tried a boot-time scan with avast? Try this first.
Start avast > right click on simple user interface > select Schedule boot-time scan > follow directions
If that does not help ...
Please download HijackThis from the link below, run the program but do not make any fixes, and then post the log results in this thread using the "copy & paste" method. It will probably take more than one post to be able to get the complete log posted. OR, you can post it as an attachment to your post by clicking on "Additional Options..." below left of the posting box. Someone will review your log and then offer help.
http://filehippo.com/download_hijackthis/ ***