Using Windows XP
In Windows XP, you can uninstall GRUB as follows:
Boot from the Windows XP CD and
Press the “R” key during the setup in order to start the Recovery Console.
Select your Windows XP installation from the list and enter the Administrator Password.
At the input prompt, enter the command “FIXMBR” and confirm the query with “y“.
The MBR will be rewritten and GRUB will be uninstalled. Press “exit” to reboot the computer.
The MBR will be rewritten and GRUB will be uninstalled.