Hey guys, I get this error occaisionally and my graphics driver crashes. I reinstalled the driver to no avail. I do know that my graphics card is rated for a minimum 300 watt power supply and I only have a 250W.

This usually happens when running Photoshop, or Yahoo Video Chat.
Sometimes, when running Photoshop for a while, if I open another graphics program, my PC will go grey and I have to manually reboot to fix it. I get a kernel power error in my event log.
Please help.