BleepingComputer.com: XP Login to Blank Blue Screen

I was running a regular spyware and antivirus sweep with AVG and SuperAntiSpyware. The SAS found a few items to remove, and then asked for a reboot. I selected yes and when the machine came back up, I could log on, but the only thing that loaded was a blank blue screen with a cursor (that moves). Num Lock and Caps Lock both toggle, but I have no ability to right click, CRTL-ESC and CRTL-ATL-DELETE have no effect. Tried to boot in normal, safe mode w/networking and safe mode - all boot the same way. I have my XP disk and did a repair install, but no luck. I have been looking at the recovery console information online. I ran a CHKDSK /P and which found one error, and a CHKDSK /R repaired the noted error. I searched the forums but all other similar problems, everyone else has had right click capability, can pull up the start menu or get to the Task Manager. Any help you can provide would be great! Thanks