Ok, so I installed OpenSUSE, and it was working fine (beside the fact it formatted windows), and so I installed Windows XP, and at the startup, it said some .dll file was missing, and please reinstall XP. so I did, and now OpenSUSE doesn’t show up on the boot menu! I installed OpenSUSE on a 7GB partition, made a Linux-swap 1.5GB, and had a 27GB partition for xp. I need to know how to put OpenSUSE on the boot menu! I’m pretty sure that it is still installed, because the OpenSUSE partitions still show up on the Disk Management (part of computer management (part of “administrative tools” (part of control panel))). any help would be appreciated! thanks in advance! 
What like to use boot.ini or GRUB ?
It is possible with boot.ini never did it before
Wiht Grub you have to reinstall GRUB
Dobby9
What did you install openSUSE with, the Live-CD or the DVD? And when you re-installed XP, did you install it to the same partition it was originally on (that is, the first) or do something else?
Boot on the openSUSE DVD - choose “Repair” - then choose “Reinstall Grub loader”. Done.