Unable to access internet-Critical Problem Message

[IanCraig]

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?

[Firefox]

Hello IanCraig, and welcome to Malwarebytes.org

Indeed it seems that you still have an active infection on your computer.... Please follow the instructions below to have an expert help you with cleaning it up....

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