DavidR and Pondus:
Pondus- Care to elaborate re sigcheck comment?
David-OS is Vista x64, with all updates.
Avast identifies it as a "High Risk Virus" not Malware.
The scans I've been doing are full system scans and I just completed another full system scan,and while the file is still in my system, Avast didn't identify it as Virus.
I have made no changes, all settings are default.
I have run scans on the Windows Folder with no virus reported.
One other anomaly, which I have now confirmed, is since installing AVAST I am now getting Blue Screens each time I run a full scan. I haven't caught the actual timing, as I have scheduled scans are at 1AM, but having just completed one today as a test, I had another blue screen. I have had this system for five years and have never had a blue screen until now. So something else is going on as well, but what, I have a couple of other things to try, to isolate the cause.