Hmmm... files infectors are really difficult to clean.
Does avast Cleaner fix it?
http://www.avast.com/i_idt_171.htmlPlease, read all the instructions carefully first!
If this doesn't help you, please come back with detailed information on the deleted viruses/worms: exact virus name and full path/folder/filename for
each virus/worm/malware. You could see avast! report/log for this.