i remember in fallout 3 that i couldnt instal it on my pc or and of my friends pcs and i was wondering if it should install right

Have you upgrade since?

If you haven't don't bother.

If you have check the Spec requirements

http://cfs13.tistory.com/image/33/tistory/2008/11/10/10/17/49178bbac6a12

You're going to need to provide a little more information.

Why couldn't you install it? What error messages came up, for instance.

everytime on fallout 3 i hit new game it would crash my pc

Probably because your computer doesnt meet the requirements.

Post a DxDiag. Instructions are in the stickies and on google.

http://www.gamesas.com/index.php?/topic/1122570-how-to-dxdiag/

Post your dxdiag, and I'm sure someone who can help will help.