I had a computer problem not too long ago. Not sure if it's similar to yours, but basically my computer would shut down randomly and all of my anti-virus programs wouldn't work or even update. I couldn't even access any AV sites online. It was hell to fix and took more than a week. It ended up being a nasty piece of malware that stuck bits of itself all over. I was able to get it working, but even then I wasn't able to get everything off. So I definitely feel your pain. Sucks to have your PC out of commission. :( Good luck getting it fixed.