I was haveing problems with PS CTDing and sometimes even rebooting my machine. After trying a lot of different things suggested (reformatting, moveing to c partition, updating all drivers, and scaleing back planetside graphics) i still had no success. Finally, I stumbled upon a post somewhere (I wish i could remember so I could give credit) that suggested changeing my RAM voltage from 2.5 (default for me) to 2.6. After doing this my PS played the entire day without crashing, but does crash every now and then, but no where near as often. So i suggest if you are crashing constantly in PS try changing the RAM voltage. Kudos goes out to the guy that found that, made my week end much better
Happy Fragging.