Sound ?

i'm having problems with my sound , ever since last patch i start having trouble with the game. its always 1 thing atleast that goes wrong
it goes like this :
1# i lagg alot
2# i don't hear any noise from guns , footsteps whatever except "fire in the hole" stuff
3# or i play 3 games for the mision and get only 1
4#error downloading profile error when i logout and normal people see there k/d ratio and stuff
5# crossfire shuts down on his own in the middle of a match

i hope anyone can help me
i didn't try to reinstall yet , almost have no download limit anymore so