Counter Strike Source problem

Hi ive just recieved my new laptop with vista and installed CSS on it. At first it was working fine but now it crashes sometimes. Basically what happens is when i connect to a server it lags and says not responding. I have to open up task manager to close it after this i get a message saying HL2.exe has stopped working. Also sometimes when im playing on servers this happens. I think this may be a problem with Vista. Does anyone know whats going on?

Thanks in advance.

I've found letting steam search for servers eventually will lead to it killing the internet, I have to manually stop searching to save it.

i have the same problem.how do you stop steam from searchings servers?i select stop refresh but it still crashes sometimes on some servers.and some servers never crashes
any help?