Look in c😬Documents and Settings - does your username exists there?
I would also recommend you switch your file system to NTFS. That way, if you computer crashes, you can recover your data better.
http://www.microsoft.com/technet/prodtechnol/winxppro/maintain/convertfat.mspx
I don't use Windows anymore, so all my knowledge is quite old. Linux on the other hand...
Anyways, rename that folder. Create the username and it should create the same directory again. Go into safe mode NOT as the new user, but as the Administrator and rename the new folder and move back the old folder replacing it. Reboot and it should all be good.