I have solved most of the leftovers. In properties under the General header there was a security option that needed to be unblocked. Unfortunately there are still a few left that didn't have that option. So they will still not show. Still trying different options.
Can I go back to the first post. These files are in folders held on an external drive. When loaded onto my PC (vista ) they all show the preview. When loaded onto the Laptop (windows 10 ) the stubborn few will not show. I do not have Icaros downloaded on my PC. So I do not think that is the answer.
Finally resolved my problem. Re-installed Media Preview on my laptop. One of the options on their toolbar is Testing & Cache. You simply drag the problem thumbnail from your folder and place it over the target on this page. Immediately corrected. Hallelujah!
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