CRASHING issues

im running vista i think 64bit or what ever the higher number one is and yes i know im not good with comps but i do know my comp can handle crysis with high graphics and its runs smooth and my internets good but after every match the game crashes saying something has stopped working sry cant get the name right now im uninstalled and am currently redownloading a fresh copy of the game but it was crashing after every game in lobbys when i switch weapons in storage picking a server or just trying to log into the game.

and the other thing is that unless the games waiting i cant click the ready button its lit up but unclickable so i cant join any game unless its waiting dont know if thats an issue or if thats how its supposed to be but i see other people who ready up in that same lobby >.<

and yes i did read the forums about 20 pages worth and then got bored lol i have seen a few other crash threads but nothing explaining this many crashes repeatedly