You say it crashes your computer. You should check if the option to reboot automatically your pc is on or off. If it's on, disable it. Check
here for instructions.
This should, in case of reboots due to severe operating system errors, give a blue screen instead of a reboot. It's however a good practice to disable it in any case. If you get a blue screen, write down the reason of the kernel error and the numbers and do a google search. It may give good hints.
Overheating problems: make sure fans are working and clean, and that you have a good airflow inside the case. Check the temperature with some tool like Everest, but there are many others.
RAM problems: Check with memtest86 and prime95 (two good ram testing tools) if there are errors.
Driver problems. Use drivers that are certified by Microsoft if possible. Use dxdiag to verify it.
There are possible additional causes (CPU, faulty vga card, power supply problems, and others) but the description of the problem you have is too generic at the moment. Try to find out more.
As long as you're able to verify and give information, you'll probably get some useful hints here. But at the moment it's almost impossible.