A few days ago my Sony Vaio VGN-TZ21WN became infected despite Windows Defender and System Mechanic Professional running! I managed to install Malwarebyte free download(I now have purchased four licences) I can boot up without internet access but when I try to connect I get -"Windows has encountered a critical problem and will restart automatically in one minute. Please save your work now." I now also get a message from Malwarebytes that they have stopped connection to a malicious site IP 91.211.117.111. I have successfully removed the Win32/FakeCog Trojan but although running Malwarebytes over and over many times the RootkitAgent File and Malware.Trace HKEY are still in the system. What steps can I take to remove these please?