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Thanks boys I'll come back and let you know how I get on, it will probably be tomorrow before I can do anything. :)
The av part of the file name suggests association with an anti-virus program or maybe an audio-video program.
avutil-52.dll at DuckDuckGo
Thanks for your answer Berton, it looks though as if I might not have to do anything as I didn't get the message today. I did notice an icon in my Show Hidden Icons down on the Notification area of the task bar, it was the RealPlayer with RealTimes.
I'll keep my eye on things but at present I don't think I have the problem anymore. :)