please help me out

after the new update i havent been able to enter any server until i set it to 32 bit but the big issue now is after the update if i load a server and it has a issue and stops loading and i alt tab out i lose my mouse on desktop and i cant do anything other then restart my PC. i managed to get into some servers but if it restarts i have to restart PC aswell to get back into the server

i tried first to validate trough steam that was ok then when it still wassent solved i tried complete reinstall but still same issue i ony have it with arma i dont have this with any other game there i can just alt tab out and i still have a mousepointer on desktop page