When I try to join a server in Counter-Strike: Source, I get this problem. The audo and the graphics go really slow. It's like "Co-un-ter-ter-ror-ist-ssss-wi-nn". And the screen moves extremely slow. I try setting all the video settings to low but I get:
Use Memtest 86. It is having problems accessing parts of your RAM where it wants to write information for you game. Other than that i would say do you meet all requirements? If so then there is a major bog down in your system to not be able to run CS. Also are you trying to run CS 1.6 or CSS?