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It sounds like something is preventing the launcher from connecting. There are lots of things that can cause this.
If you are using Windows Vista/7/8, please try right clicking on your game shortcut and select the Run as administrator option.
Disabling or temporarily uninstalling firewall and anti-virus programs (Norton, McAfee, etc) can permit the patch to complete successfully. Of course, do not remove security software if you can't reinstall it, and always restore disabled security after patching.
If the issue persists, we can try resetting the launcher files completely. Follow the steps here to do that.
I am running McAfee and did drop the firewall to try and patch. nothing different happened. Same when I deleted the Battle.net folder same results. The launcher sets up get 1/2 way through checking for updates then gives me the error message. I have tried to open it as the admin as well.
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