Vista and half life 2.

I need help, in half life 2, I get to the initial startup screen, it's the blurry splash screen, the screen goes black several times, then it says HL2. exe has stopped working. Cs:s runs fine but Hl2 doesn't. I have UAC turned off, I ran it in adminstrator mode(Even though I am already the administrator), I checked run in compatibility mode for xp. I have vista home premium service pack 1. My specs exeed the required specs to play the game, and I am reinstalling my video card drivers. IF this doesn't work, what should I do?

don't know what the problem is but HL2 runs fine in vista and compatibility mode isn't needed

Assuming we're talking about HL2 and not Episode 1 or Episode 2: Is your Vista 32 bit or 64 bit?

If you have 64 bit Vista, try adding -32bit to the Launch Options before going through the whole reinstall thing. HL2 tries to run in 64 bit mode automatically when you have a 64 bit OS. But for some reaons it doesn't work for a lot of people and has to be forced back to 32 bit mode.