I have this kind of problem too
I use dual boot too, but my problem is that after I reinstalled WinXp, my computer boot up in Xp, and Redhat load sequence disappeared just after I performed Xp reinstallation. I tried to solve this problem using a boot diskette but I failed to repair Redhat. I also tried using fdisk and Partition Magic but it was useless.
Is there something I can do in order to reestablish Redhat boot sequence?
(I use Redhat 9.0)