DCOM process server terminated unexpectedly

My main computer is now in a mess because of an error message and/or virus I cannot unravel: DCOM process server terminated unexpectedly.

The message appeared shortly after I installed an updated version of McAfee's anti-virus software. The thing acts like a virus in that it won't let me run either of my anti-virus packages, McAfee and Malaware bytes.

Yet, I wonder. It has also diabled my Internet connection via a wireless router I share with my wife's computer. Her computer works fine, but min...