Malwarebytes found this...
I'll do the other scans and see what shows up.
It doesn't seem to have resolved the virus dropper issue though as Avast still tells me it exists. Is it worth using the Malicious Software Removal Tool by Microsoft?
You could try copying/restoring that file and try uploading it to virustotal, the problem being MBAM restores to the original location (I don't like that with suspect stuff), this isn't the same as the MediaIconsOverlays.dll as system restore changes the file name but retains the file type and this isn't a dll file.
I'm not a fan of the Malicious Software Removal Tool as I don't think you have a great deal of control over it.
Do you actually have the Microsoft Media Tools installed ?
I can't ever remember installing this on either of my systems, so I obviously don't need it. I just wonder if you did install it, have you ever used/need it ?