This is my very first participation in a community forum hence may need some assistance to place in the correct place . Siteadvisor was mostly gray when I did internet searches with no green ticks . Best efforts with Technical Support would fix the problem for one session only . After closing computer and restarting problem would reoccur.
Solution : I have a LAPTOP computer which I had set to SLEEP mode when I closed the lid . Since I have set the computer to HIBERNATE mode when I now close the lid EVERYTHING with Siteadvisor works PERFECTLY ... 4 weeks now without a single problem ... indeed McAfee now carries out functions that never previously occurred .
This info provided to hopefully assist others .