I can't open search engines because, according to the latest update, I didn't contract a "malicious bug" but a worm. I can't open my "hosts" file to delete it or do any of the other things instructed by msn to correct this problem. Any suggestions? I have downloaded Spybot and Spywareblaster, but that's for the future, right? I'm doing what I can to prevent this happening again, but what can I do to fix the problem the worm has caused now?