I've had MSSE on my dad's laptop for a few years now. He recently mentioned his laptop was very slow, so I guessed it was overdue for some maintenance. A quick look at task manager immediately flagged up stdrt.exe using lots of resources so I got MSSE running while I checked online to find out what this thing was. It's not new by any stretch and looks to be fairly commonplace. MSSE failed to find anything, even when I scanned the executable directly. I had to install Malwarebytes Anti-Malware to remove it (which it did quickly and easily).
I've removed MSSE and set him up with AVG Free and Malwarebytes.