Sleeper Service=GCHQ= wrote:
its not your memory it a random source engine error. I get mine in the DX9 flavour. Id not worry about it too much unless it appears frequently. Ive had it 3 time in a year and a half
I also had an error like that once in game that told you to tell a programmer. Not any specific guy just a programmer.

lol remember that
Yeah, I think most Steam users get it from time to time. I used to get it everytime I alt-tabbed out and back in again, updating my graphics drivers solved it.