Thank you for the link, Tech! I'm just chiming into say that I also had the exact same problems. I'm running Windows 7, 64 bit, 4 gigs of RAM. I couldn't open anything at all, save for some things in Windows Explorer, Pain, and Wordpad. That's about it. Firefox, iTunes, VLC, IE (not that I use it; just wanted to check), AIM, absolutely everything either would not open, or it opened, crashed, and then wouldn't open. I obviously don't like other people having issues with their anti-virus, but at the same time, I'm glad it's not just me, and that I didn't do something unwittingly insane to screw up my computer.