it has infected virtually all my executable files, how do i remove it?
Hmmm… files infectors are really difficult to clean.
Does avast Cleaner fix it? http://www.avast.com/i_idt_171.html
Please, 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.