Login ByPass??

OK i FINALLY finished the whole 15 Patches and the torrent download. After that it asked for an Account? I put in my Battle.net account but wouldn't let me(I know i have to be approved from Battle.net to go but i know theirs a by-pass somewhere) I don't trust the sites i search on Google because once it gave me 12 Trojans and my computer went REAL slow.. Please tell me if i need another bypass after that like for Ex. i would need some kind of Bypass to play single-payer against a computer or offline. Please help.

My friend plays the only singleplayer version. Ill see what I can dish up from him.