Half-Life 2 problem

I just bought Half-Live 2 (Episode one), and for some reason, it just randomly locks up. I don't know why, but it's getting annoying ass hell! Does anyone know what i'm talking about?

I have a 5500 GeForce XFX Video card (crappy I know), and I cant find the drivers for it. Could someone help me out?

Thanks!
K2skatn

 

Ill assume your using windows xp

http://www.nvidia.com/object/winxp_2k_93.71.html

 

Yes.

 

And thank you for those drivers. I looked into my problem, and I guess I have a crappy motherboard also... It's somthing like AsuSu, or somthing like that.
I downloaded the thing that steams faq told me to download, and it still locks up. Oh well, maybe this is will work.

Thanks!
k2skatn