|This is how you should have done the repair, if you did'nt, don't try anything for now until I know the answers to my questions.|
Boot off of a clean Windows XP cd ( your bios has to be set to boot from cd rom 1st ) choose Install ( Not > To Repair a Windows XP installation using Recovery Console, press R ) at the first prompt.
It will then search for a previous copy of Windows.
When it finds your copy, it will stop at the next prompt and ask if you want to do a repair. Hit R at this screen.
If it does'nt mention a repair > DO NOT continue.
It will then copy a lot of files and appear to be doing a reinstall ( But its not. All your programs and data are safe, all you will lose, are your Windows updates )
This will allow you to add accounts to the system that will be administrator accounts, it will also fix most problems in XP.
Did you use the 2nd repair option?
What version of Internet Explorer are you using?