Help! Possible virus

[euphfellowship]

If anyone can help me with this, I'd be forever in your gratitude.

I think I may have a virus, I don't know where it may have come from, or how to detect it, but hopefully someone's heard of something with my symptoms and can help me out.

The problem started this morning when I tried to use my computer. I turned the monitor on, and found that no matter what I did, neither the mouse nor keyboard responded to my actions. Since I have a wireless mouse and keyboard, I figured I'd pull out the old wired keyboard and mouse, based on the assumption that there was an issue with the wireless stuff. But, they too did nothing. So I hit the reset button. Computer loads up, seems a little on the slow side (I just upgraded last week to an AMD X2 4400+, 1GB RAM, but using my old hard drives), but nothing too serious. I try to open Firefox, and it appears on the processes menu in the Task Manager, but it fails to load every time I try, after numerous attempts to close the program and then run it again, nothing happens. Frustrating.
So, I clean up the Startup in msconfig, which seemed to be loading a lot more stuff than the last time I rebooted. I restart, and I get an error message right after the POST telling me that my primary master has something wrong with the S.M.A.R.T., I didn't catch it because I was really pissed off by now! I hit the reset button again, and that message didn't pop back up. When XP finally loads after what seemed like about 5 minutes (usually takes less than 30 seconds), I discover that my nVidia drivers are non-existent, and that for some reason, the only colour and size settings available to me are 4-bit colour, and something like 800x600 screen resolution. Infuriating.
Reinstalled the nVidia drivers, and ran a virus scan using AVG, which found nothing. The icon graphics in the taskbar are still primitive looking, it's like I've combined a new computer with a very, very old one. It's still running a little slow, and Firefox still won't open. I had a virus a while ago, about a week and a half ago, a few days before I upgraded. I didn't seem to have any problems after, could this possibly be what my problem is?

Any help at all would be marvelous. Thank you!

[johnwill]

Please follow the instructions here (5 pages) and then post all the requested logs in a new thread here for the security analysts to look at. If you have any trouble running any of the scans, leave them and move onto the next.

The security forum is always busy, so please be patient and you will receive a reply as soon as possible. If you go to Thread Tools > Subscribe at the top of your new thread you will receive an email as soon as a reply is posted.