Whenever I start F:NV from steam, the game, or launcher I guess, will just become a black screen and crash.

What are your system specs? Please post a Dxdiag report on this thread following http://www.gamesas.com/topic/1122570-how-to-dxdiag/

Are you using any mods? If so, then please post your load order.

I'm trying to post the Dx stuff but it just says "saving post" forever.