How did you partition the drive? I now always use a GParted Live CD
rather that the tools on the Suse install disks. This gives you a minimal Linux that will run in about 50Mb of RAM, with some good GUI tools, apart from the partitioner.
If you are going to play, I suggest you start with this 5 or 6 Gb for the root partition "/", about 1Gb for swap, and maybe a 10Gb /home partition then make the rest some backup space for keeping data in while playing. Format all except the swap partition to ext3 for least hassle.
If you get the "not enough memory for YaST" error again, it should also say something like "use /dev/hda4 for swap? Continue?". Hit enter and it should continue.
If you still get trouble, boot the GParted disk, open a terminal and type "lspci" at the prompt, and it will give you a screen full of data. In the data will be a list of your hardware.