I'm just grasping at straws here, but it sounds like you may have an issue with flash.  Do you have the latest version of flash installed?

You're not using PrecisionX 16, are you?

I do have PrecisionX 16 installed, but did so only after the problem occurred and thought it might give me options to try and resolve it.  To the second question, this is the free upgrade to Windows 10 from Windows 7 so I don't have the disks to do a clean install..  I do have another almost identical machine but with an 8400gs instead of a 210, which has also followed the same upgrade path and it exhibits no issues.  I'm going to try and re-install the Nvidia driver tomorrow and maybe even try the DVI out instead of the VGA connector just to see.  I didn't have a DVI cable with me today and my monitor will go either way.  Thank you all for your help!

Thank you for the information and links.  That's great!  I have never done an upgrade before - always new installations because I didn't want any baggage left over from the old system.  This will help immensely!
 

Thank you all for your help and good advice.  I sat down at the computer this morning and rolled back the driver to a previous version.  Problem gone.  I didn't even realize that an updated driver had already been installed!  I just put the card in there yesterday morning.  Anyway, it appears there is an issue with the newest driver, at least on this particular card.  Again, thanks!
 

Well, it turns out that I spoke too soon.  When I clicked to revert to old driver, the screen resolution remained the same, 1920x1080, which is the optimum for this monitor.  Videos at first glance appeared to play just fine.  But...  A few seconds into the video it starts to skip frames big-time and get's pretty herky-jerky.  Web pages were now loading painfully slow too.  In fact I rebooted the machine to see if things would improve.  Windows 10 then re-installed it's vanilla driver at a low screen resolution.  Tried the videos and they played perfectly.  Let Windows 10 re-install the Nvidia driver and I'm right back where I was yesterday with scrambled video.  I guess reverting to the old driver was actually going back to the Windows 10 basic driver instead of a previous version of Nvidia's driver, but curious how the video resolution did not change until a reboot.  Before doing a clean install of Windows 10 (or reverting back to Windows 7) I'm going to try a DVI cable just to see if it makes any difference.  Tried using a DVI to VGA adapter that I had on hand to see if the signal coming out of the card's DVI socket was any different.  It wasn't.  It's almost like the codecs are missing for mpg, mov and flash videos, but only with the Nvidia driver. 

Here's the result.  At idle the machine is using 1.8 gb of the 4.0 gb installed.  When I run one the .mov files that's giving me trouble the memory usage only increases to 1.9 gb.  No peaks, just a mild shoulder up and then back down when the video is closed. 

Here is one of those "scratch your head" moments..  I downloaded VLC media player and installed it just for grins.  It works flawlessly with the .mov files that nothing else will play.  Downloaded an .mpg file and it played perfectly.  wmv., no problem.  This is weird.

If it works with VLC Media Player just leave it alone! LOL  It works, don't it?

That's one way to solve it but I thought you nailed it by using VLC. No warranty on that board?

MSI video boards seem to have a long lifespan. I have an old n450gts from 2010 that's still good for a spare if one of my main boards fails.