Ok, I have tried both of the video cards listed above.
My system configuation is as follows:
Windows XP
800mHz Intel P3
384 MB ram
ABIT VA6 motherboard
via chipset

Whenever I run a 3d game with either of those cards, it crashes and displays a different DLL file almost every time as the cause of the crash. Has anyone expereinced this before, and if so how did you fix it?