I'm not sure I exactly follow, but let me try to rephrase what I'm reading:
You are in VMWare, and you have to boot from a boot disk to get in (I'm not too familiar with how VMWare runs, so this might be a part of cofusion). Yet instead of booting from the bootdisk to your SuSE install, it attempts a re-install instead.
This reads to me like your boot disk is in fact not a "bootdisk" but rather a launch disk to setup an install. What kind of boot disk is it, CD or floppy? If it's floppy, how did you create it? There should be some graphical tools in Yast2 that will help you setup a true bootdisk to your needs, if you haven't used one of those, give em a try.