XP reboot loop / Admin password not recognizd

Hello,

This morning when I rebooted my computer, Windows installed an update.

When I rebooted, my PC went into a reboot loop.

During one of the reboots, I pressed F8 to go into Safe mode, but the computer would reboot at the file

AVGIDSxx.sys

I went to the AVG forums and found that AVG has been causing people problems. I followed the AVG instructions to disable all of the AVG-related files via repair mode. My PC still would not open Windows. Rather, it now got stuck at mup.sys

I then followed the instructions here:

http://2pure.net/index.php?session=0&action=read&click=open&article=1150238652

Doing step #11, I used the highest number (24 in my case) then followed the rest of the steps. I think I should have used restore point 23.

When I rebooted, it went back into a loop. When I tried to go to Safe Mode, it would stop at AVGIDSxx.sys again...

I rebooted with the XP cd in again and went into repair mode... but this time, it won't recognize my administrator password.

I am posting from my laptop.

I am stumped.

Does any of this sound familiar? Did I somehow change my password?

Thanks
Joe