Source SDK problems

Ah damnit not again . . .

When i try and run hammer . . . or hell any source game i get an error saying "hl2.exe has incounter a problem . . bla bla bla" I've tried reinstalling steam many many times. Any help?

Thanks in advance.

They didnt help. I asked a few weeks back.

Ok let me just get back to my house and i'll got a screen shot of it.