[caf4926]

If you switch boot order of HD's to set the windows HD first, it should boot windows - OK.
If the SUSE drive is set first and it does not boot, then you have set grub incorrectly.

You situation is ideal really. Just make sure windows is working and will boot if it's HD is first to boot in BIOS.
Now switch to the SUSE HD first in BIOS - Install SUSE.
Pay close attention to how SUSE sees your HD's eg; hda, hdb, or sda, sdb... and so on. Know which is which!!

When you reach the install summary in SUSE, before the install starts, click on the 'Booting' section and make sure ONLY the MBR box is checked in the grub installation settings, and that it is the correct HD it is going too also! When it shows the summary again check it is showing to MBR and the correct HD!

Even if the grub fails to boot windows, don't worry. We can easily fix that.