Error codes 2 and 14001

Hello there, on recently purchased laptop I cannot play diablo 3. on old dell laptop it works. in fact on the new computer I could run it only once (yesterday evening). when in battle.net I sign in, after that it takes quite some time and than it shows : Lost Connection. There was an error. (code 2). and when I try to sign up again it shows: Warning! there was a problem logging in. (code 14001). anyone could help? it is silly that I can play it only on old non gaming laptop, while on new gaming laptop it does not work.