I have had the EXACT same problem with the launcher. I have been looking around and tried all of the methods such as System Restore, changing the values of EULA agreement to 1 and other stuff. The only solution for me was going to: Control Panel>Programs and Features>View installed Updates>Uninstall your latest Internet Explorer update. Restart the computer and it should work, apparently Explorer 10 and 11 has some bugs with the launcher so if you uninstall the update it should downgrade/rollback your explorer browser to 9 (which it did for me).