v4 crashing pc

[MysticX2X]

Well my other pc i cant temporarily use so im using this pc. It isnt so good, you could say crappy. But i saw the min requirements for v4 and it fitted it. When i run the installer, it crashes my pc. I tryed it a few times and it still did. I then had a friend install a fresh v4 and send it thru aim and when i try logging in, it still crashes me? My computer is kind of old. It runs at like 800mhz, and 256 mb of ram.

any suggestions?