This is literally the exact same thing that happened to me; same file, same location, same service.
I have tried almost every anti-virus thing that I can find.
Malwarebytes
Avast
Combofix
SUPERAntiSpyware
SpywareBlaster (I know it is passive, but It has yet to find anything ...)
I have had avast run a boot-time scan; nothing was found for any of the scans (aside from SUPER, that found some bad cookies)