When im using my computer, after 5 minutes it take a shutdown or it will be hang.

Have you checked the fans? Most desktops have a fan on the rear near the power cord thats part of the power supply, and a 2nd one on the CPU. You should feel air moving or be able to see the fans running (flashlight might be helpful). Sounds like a fan isn't running and the system gets hot after 5 min and shuts off. You should be able to remove the side cover and turn it on and see if the processor fan is running. Computer stores will have processors fans, power supply fans are usually not replaceable and you'll have to replace the whole supply.