I'm running a dual-boot win/linux right now, and have been for a long time. I almost never use windoze, though, except for one purpose - transferring files to/from my mp3-player that hasn't yet started working in linux (working on it)...anyway, I've had several distros and all they have worked nicely with dual-boot...there is a simple receipt to follow in order to get the dual-boot without problems:
1) windows must be installed first
2) make linux partitions: boot, root and swap
3) install linux so that the bootloader (lilo, grub) gets installed into /boot _partition_ and NOT in the MBR. installing to MBR means quite often that you'll encounter problems sooner or later with windows's loading
4) after installation, everything should work all right
and if you encounter problems like re-installing either linux or windows, installing the bootloader into it's own partition saves you. the magic is this: when you install windows, /dev/hda1 is the active partition that's being booted. now when you make your linux partitions, make hda1 _unactive_ and then make the _boot partition active_ - this way your bootloader gets booted and it handles the rest. if you need to reinstall windows, just switch the active partition back to hda1 (win installation) and windows thinks it's the only OS and won't destroy your linux, nor itself. after reinstallation, switch the active partition back to your linux bootloader, and everything works...
nowadays installing the boot-thingie into MBR might work too, but I never trust that. I've screwed up too many installations by doing that - they worked either two seconds or two months, but at the end didn't work at all and I had to reinstall _everything_ - so that's why making the bootpartition active is a wise thing and leaving MBR as it is is too...let windoze keep MBR, if it wants, to keep it "safe" from itself.
I think you're safe to install your SuSe...I haven't used SuSe myself, but as I've used many other distros (several RedHats, Gentoo, Arch, Vector etc.) I guess I can say you don't have anything to fear....
the only "dangerous" thing about dual-boot is that if windows gets to overwrite your linux bootloader, chances are neither of the OSes work, or if you overwrite MBR where win resides, win gets screwed. avoid these mistakes, and you're fine
EDIT: oh, forgot to mention - my windoze is too Win98SE that came with this pc