I ran the install from a cmd (DOS window, which was opened by using 'Run as Administrator) and then ran the isntall. It worked. Though I got this error at the end of the install, but it works:
Exception Package 'ToolBox Control Installer Package' failed to load. StackTrace: at EnvDTE._DTEExecuteCommand(String CommandName, String CommandArgs) at 0.a.0(String[], String, String, Boolean)