Avast has just popped up here telling me that this is a rootkit. Checking on line gives me the same size and the properties tell me that it's been here for over 3 years and is MS so I've left it.
Yesterday evening I did a full scan with SAS, MBAM, Malware Destroyer, Spybot S&D and a boot-time scan with Avast (I do this once a month) and there were no problems.
I don't know what deleting it would do...!