Boot Problem and Lock-Ups

I'm not that advanced with motherboard technologies, so I'll ask my question in Layman terms. I have a HP Pavilion 761n that comes equip with a MSI board, AMD Athlon, Win XP and 512 DDR SDRAM memory. My first signs of problems began when under normal computer usage the screen would go black then come back on and the system would then be frozen and need to be restarted. This would happen after about an hours worth of on time. The time then went down to 30mins then 15mins and sometimes even at the "welcome to xp" screen it spontaneously restarts itself. I thought it might be a video card problem, but I have tried installing an invidia agp with no luck. Any suggestions on what the problem might be or where I can start to diagnose the problem? Thanks.

Where and how could I check the power supply? Where is the CPU heatsink/fan? Would I need a special device, such as the one to be found @ CompUSA? I did have an enormous amount of dust in the computer, I tried to clean it the best I could, but I may have missed such places as the ones you listed. Thanks again.

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