Hello again citizenx
It looks like a virus has infected your Windows explorer file.
We need to be able to get you to logon to help us fix this problem. Have you tried booting into safemode?
Boot into Safe Mode by continuously tapping the F8 key as soon as the computer begins to boot/or as soon as you hear your pc bleep. A menu should come up where you will be given the option to enter Safe Mode. Try logging on in any of your accounts that have administrator priviledges or the extra administrator account that you should be able to see.
Then you will have to get an explorer.exe from another computer (make sure it is the same language and Service pack) and copy it into your c:\windows\ folder.
If you have no access to another computer with xp service pack 2, let me know and i may be able to email you a copy.
After you have copied the explorer.exe into the windows folder, try pressing Ctrl+Alt+Del to bring up the Task Manager go File > New Task (Run) and type "explorer.exe"
If you are successful in replacing the file, please download the latest version on Hijackthis as you are currently using a beta version.
Download Hijackthis from here