Grub on the MBR is fine for dual boot (usually). Post your
/boot/grub/grub.conf here and I'll take a look at it.

If you still aren't keen on Grub being there, you can do the following:
1.) Make a Grub boot floppy (and test it!!!)
2.) Pop the WindowsXP CD in the drive and boot from it.

That should restore the MBR. You can then:
3.) Reboot from the floppy and reinstall grub not on the MBR.

However, that's more risky. Try posting the grub.conf first.

bob wrote:
> I wrote GRUB to my MBR (by mistake). GRUB was not correctly configured.
>
> I get a GRUB prompt and I am stuck when dual boot to XP; Gentoo
> choice is OK.
>
> What to I do to fix my MBR?
>
> ----
> Bob---
>