What is MPGEAR.DLL? Is it the same as mpengine.dll?
Why do you ask? (No, it's not the same as mpengine.dll.)
When (exact date, preferably) did you upgrade (I assume) to Win10?
Is Windows Defender working properly as far as you know or...?
Is it the same computer (NOT THE SAME PROBLEM!) as in this other recent thread of yours? => http://answers.microsoft.com/thread/2924696b-2880-4589-80ce-9526a550389e