Want new video card and PC crashing

I have verry slow pc and i need beterr video card if someone could give one away i'll be werry hapy and grateful and new cooler to loking for old one but working becouse my pc is strting crashing or how does it calls dont know just if you leave it for 2h it just stops i see screen but mouse corsor is not moving ang keybord isn't reacting i cleaned my pc from dust isn't working

Motherboard: nForce3 DDR: 8KDA7I Series
CPU: AMD Sempron(tm) Processor 2800+
 
You can't overclock a computer that has problems with crashing. You will just add to the problem
 
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