Ok, I'll move this back to XP. It sounds as though your profile has corrupted so you will need to create a new one. I see that you have XP Home so you will have to boot into Safe Mode to access the dedicated Administrator account.
To boot into Safe Mode, restart your computer and tap F8 continuously as it restarts. Once Safe Mode has loaded, logon to the Administrator Account and then follow the instructions
here.
Reboot when finished and logon normally to your new account and tell me if this made any difference.