If you are going to reinstall windows, the easiest way I know of is just to boot to the Windows cd, repartition the drive and reformat. If you like and want to keep the Suse then I would think about adding another hard drive and installing Windows on that.

Now FYI lots of Linux distros have whats called a "Live" cd, meaning that you can download that image, burn it to a cd and then you have a bootable Linux cd that you can use to see if you like that distro or not.