Whenever i load Counter Strike Source with or without junkies it runs incredibly slow. i have all the recommended downloads but it extremely laggy. please help.

Whats you graphics card . The game shouldn't run slow even on bad gfx cards so i think you better check what all processes are running on your pc . If you have something like zune player installed then either uninstall it or disable its sharing since it takes aboout 2 gb ram