Please check the version of McAfee if possible (Understand that PC performance is slow). I suspect that the setup/Installation is corrupt and would recommend contacting Tech Support https://service.mcafee.com
Thanks. But hey couldn't help me either . At least uninstall seems to work at last!!
Did you mean a Re-install (uninstall + install from account) worked? If yes let's monitor for couple of days and mark this thread "Solved"