Please explain the "dual boot problem".
Also, include the contents of /etc/fstab and /boot/grub/menu.lst.
Dual boot problems usually boil down to inconsistencies between those two files. More specifically, something in menu.lst doesn't agree with something else in fstab.
It would also help if you told us what the 'other' operating system is that you're trying to dual boot with SuSE.