First, take the case cover of the computer and use compressed air to blow out all the dust from around the processor, heat sink, power supply and all fans and vents. Next, you may need to replace the thermal paste between the processor and heatsink.. Everything needs to be clean and cool in there.
Next, most recommend a substantial power supply for gaming computers.. Something in the neighborhood of 500 - 600 watts or more may be necessary depending on the needs of your graphics card, etc.
Hope this helps.
I have a gaming computer but am having a lot of trouble my pc crashes all the time whilst plaing games
I have updated all my drivers scanned my pc for problems and still it crashes please help?