i just installed the game and clicked on battlenet and it trys to connect then error(there was a problem trying to write to your hard drive while downloading free some space or check your hard drive can someone help?

Its trying to update and you do not have enough space on your hard drive to do so... Delete some stuff if you want to play online.

ive got 1 terrabite om memory and ive got barely anything on my computer cause its new

what he is saying is try delete some stuff..... lol

Downlaod the latest patch manually and try that!