I tried System Restore-- I don't have Go Back, but I will look into it-- when you're facing many many gigs of data loss, it's a cold hard feeling I do not want to feel again if I can help it. I think this was the Nimda parasite and it hit the sys restore files FIRST! Vicious. I cleaned the whole mess up, installed MacAfee and got hit again a day later, again the sys restore were the very first files wiped. Half a day later, MacAfee gets a fix on the new Nimda, too late. Now, I use Norton pretty religiously -- nothing else killed the bugs first and keeps killing them with the quickest updates. I got the bad virii from EBay last fall, many of the overseas sellers were hit. So these were people I expected and welcomed attachments from. I also now have Zone Alarm firewall as a backup, it can shut everything down in an instant. Changes the tags on suspect attachments from .exe to something benign and unuseable. Emily