The diskette suggested by tbutttbutt is to put Grub unattached to Suse into a floppy.
That floppy is good enough to booot any PC system in the world if you know how to use it.
For example booting up the floppy only give you a Grub prompt but you can type in a Grub prompt
Which will make Grub displaying every partition in your 1st hard disk.
A Linux is always stored in a Partition Type 83 whereas Vista in Type 7 for NTFS filing type.
Suppose partition (0) is your Vista and the first Type 83 is in partition (1) for Suse then Vista can be booted at a Grub prompt by
and you Suse can fire up by
If you are tired of manual booting you can make "another" floppy after booting to Suse root terminal by
The 2nd floppy differs from the 1st one (proposed by tbutttbutt) by being attached to Suse and will have the menu.lst inside, with which you only tap the direction key to select distros to boot.