"Athlon64 3400+ on a gigabyte k8ns pro, with an ATI radeon 9800 pro and a 160gb seageate PATA hdd. I'm wondering if maybe my PSU is pooping out when it tries to load the higher graphics of the games. I just built this system, and the case came with a 350w PSU."

Tomshardware.com should be reviewed for his power supply articles. You need a lot more watts. Or a lot less parts.

Bob