[demoninside]

ok here it is,

for recovering XP's boot u need to---------
1. Boot from Win XP cd or run Winxp Setup from dos mode by using CD_Drive:/i386> Winnt.exe

2. Go in recovery mode by pressing R(* It will ask this question),
3. enter ur administrative password
4. use command *fixmbr*

now for installing gurb use
1. boot from cd in rescue mode by entering linux rescue in about all the distros never tried Xen* before
2. select the normal entries
3. in command mode enter chroot /mnt/sysimage
4. command [b]install-gurb /dev/hda

for more details check a thred here just search a bit u'll find it i think it's [b]tricks/b] one sticky one..........