Probaly older system without good 3d vid card. Outdated drivers, possibly?! You do need memory, though. What processor do you have (***MHZ)? We need to know something about your system in order to help you out.....
Can you tell what video card you have?? If not, right click on your desktop, click on "properties", and then click on the "settings" tab, and you should see where it list your monitor and video card, something like:
Viewsonic P-815 on a nVidia GeForce 2
Or something like that...........
Also, does your screensaver's configuration thingy come up??
Hmmmm, The Mach 64 is an older card. That would be a problem, for sure. Your best bet would be to see if that card is integrated into the motherboard and if you can update to a newer card (nVidia or ATI Radeon). See if you can get an AGP card, that requires an AGP slot on the motherboard, and definately get some more ram! 256 is a great start for XP, but 128 should suffice, depending on what you do with your system (Games or business apps). Video card can be gotten for about $100 (GeForce 2 MX or original Radeon) and memory should be around $40 for 128 megs. This depends on how many mem slots you have and if youll have to replace your mem with something bigger or not. Should be good to go after that, though. Hope this helps some.
Xsivforce, do you have any other thoughts???