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Quote from Kayzer
Restart your computer, if that doesn't work uninstall then reinstall.
Quote from Stinkfist86
These are the only 3 processes I see that come up. If none of these are showing up then I'm not sure what the problem could be. You might wanna try to official forums if we can't help.
Quote from Non_Inertial_Frame
Found the fix. Delete the battle.net folder in C:\ProgramData (which is a hidden folder)