Posted 26 October 2014 - 11:24 AM
I have exactly the same problem since yesterday...have been researching the net to no real avail. The only way I could get this to stop was to rename the windows defender folder. That keeps defender, or whatever is initiating MpCmdRun.exe from finding the executable. The problem with this is that I had already disabled Windows defender as I use IOLO system mechanic pro, which includes System Shield, a great antivirus and anti-malaware program. For some reason, after the folder was renamed, My CPU was not bogged down at 98-99%, but IOLO's Sys Mech and System Shield crashes on startup, leaving no protection...and no protection from windows defender.
Let me say that I wanted to try to just remove or update that MpCmdRun.exe, to make sure it's not a camoflaged malaware, but In spite of many, many attempts to modify the Windows Defender folder and subfolder...I could not successfully change permissions and audit entrys to allow me to make any change.
So, I'm stuck in the mud until others with more expertise can help. Please keep us posted on any successes