ok buddy i had the same problem what you need to do is click you start bar and run regedit a window will pop up click on hkey_local_machine click on the software folder find teh folder labeld battle.net and delete it and you should be able to connect you can find this and other things on the open bnet support pages these a post that has like a 5 paragraph thing explining it but i did what i told you and it let me on so up to you note the battle.net fold delete it and it only
Threaded Mode