Standard Account Getting Reset Whenever Unused?

OS: Windows XP SP3
Realtime Security Software: Avast!, ThreatFire,
Non-Realtime: Spyware Blaster, SuperAntispyware Scanner (Free Edition), Malwarebytes' Scanner
Firewall: COMODO Firewall Only

My Standard Account got reset for the 2nd time. Firstly, when I didn't use my account for 4 days once I came to log on I realised that 'Personalized Settings' was showing up at the top left hand corner. This came again after I didn't use the account for one day. By reset I mean, the background wallpaper reset to default and the desktop folders not showing up. But when I went into 'Documents and Settings' in my administrator account (which didn't get reset), all the folders were showing up in my C Drive/Documents and Settings/ folder. Once I right-clicked on a folder on my system when this happened for the first time, my system froze. The system also froze when opening any file. This started happening a few weeks after I had installed COMODO Firewall which might be a coincidence even though I don't think it is but all these error messages/dialog box popped up on my account, roughly like 'Invalid or corrupt jarfile...' but on the administrator account none of these errors showed up when this happened on my account. In addition, this issue also happened when I changed my account from Standard to Administrator but this didn't change anything. When this happened for the first time, to solve the issue I made a new account and then copied all my files/folders over from my old account to the new one but because this problem has happened again, I predict that this will keep on happening again on every new account I make. I have also run malware scans which didn't detect any viruses.