I'm not sure about that, Tech Support would know. I would have thought once in that area that was it, as far as the scanner was concerned. Why not empty the Quarantine files, then there wont be anything to scan?
some antiviruses the suspicious files that they put in quarantine analyze them in every update of signatures to verify them again and if they are clean to restore them.
And know when mcafee will have new version to fix the reported problems (excess memory,icon..)