|I am running 64-bit windows vista|
Have you tried loading up Windows XP 32bit without any problems? Vista sucks! If you are going to use Vista and not windows 7, or XP, then always have your system in a dual boot configuration with XP + Vista.
In short, if it works with XP without issues, and you have all the drivers installed correctly in Vista and it still crashes, switch to XP or 7, thats the best advise I can give when it comes to Vista.
However, if you can't get the machine to function properly in XP either, then something is obviously wrong and can be looked into further from that point on.
PowerMac 9600(1 ghz G4)
ATi 9200 PCI