I have a pc 2800+ athlon xp 512mb ram 80gb hard drive. problem being every time it try to run more then one process the machine shuts down and i have to power it off and on again. this happens over the smalles thing a pop up openingor the opening of more then one folder. the power supply is a 300w and the graohics card is running off the motherboards power any help in what this may be and how to fix it would be much appreciated