Hi
Sorry thought I had been using Process Monitor but it was Resource Monitor, Guess I should look harder.
Tried to download and use Process Monitor but Way, Way over my head. I don't even understand what to look for.
I don't understand why the Anti-virus needs to keep checking existing lightroom files, so I suppose the only answer, for someone at my level of expertise, is to try an alternative Anti-virus and ditch Comodo.