but the cd i have doesnt have the option to repair
Are you certain of this. Does the following not work with your cd?
1. Boot from the cd. Displayed message "Press any key to boot from cd" _ press any key.
2. Setup will now load install files.
3. Displayed message:
Welcome to Setup
To setup Windows XP now press Enter
To repair Windows XP using Recovery Console.....
To Quit Setup.....
Press Enter to setup Windows.
4. Press F8 to accept the EULA.
5. Displayed message when the Windows XP version already installed is highlighted:
To repair XP Installation press R
To continue installing fresh copy.....
Press R.
If the above still doesn't work with your version of the cd can you borrow a full install version of the XP cd and try that?
Good luck