Since last week, my computer completely freezes if I try to run any game or heavy program.?

Then it needs to be kept switched off for atleast half an hour.
Can anyone tell me what exactly is the problem? ^_^

Answers:
It is probably because there are some regsitry errors and remnant,corrupt files and temp files in your computer to cause "computer freezing".You need to clean you computer.
Every time you install and uninstall hardware and software on your computer and surfing online you create junk in the registry cause "computer freezing".
Basically, the registry files contain information and settings for all of the software, hardware, operating system software, and anything else running on your computer. Mess any of these files up, and the computer does not know how to function. The computer goes to start up the software, looks for the registry files, and either can not find it or finds something that does not look like it is suppose to look like. It then just sits there: it does not know what to do next. This is where the “hanging” or “freezing up” of your computer comes from.So You need to scan and clean your computer with registry cleaner.Good Regisry Cleaner can fix computer freezing prominently.It also can improve your computer and Internet performance dramatically up to 300%!
There are some comparison and review of TOP 5 registry cleaners.
http://computer-speed.info
You can download and scan your computer for free.
Have you tried updating your graphics card driver to the latest version.
Possibly the main fan isn't cooling the processors good enough...the only thing I think you could do is buy an aftermarket fan and have it mounted to the motherboard to increase airflow around, over and through it...possibly adding some small heat sinks near the processor too...
Go to your control panel and do a defrag to see how much free space you have left. You may want to remove any othe bulky programs you dont need off your desktop to gain more free space.

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