My first step in troubleshooting this problem would be cleaning the system from dust and visual inspection for fans that are not spinning, and bulging or blown capacitors, especially around the CPU and in the power supply.
...or too many incompatible or malicious programs autostarting. Testing the memory and hard drive isn't difficult at all, and would eliminate those as the source of the problem.
To temporarily disable a program remove the check mark next to it. To remove it completely...
Help your friends and family get off Windows XP
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