Hi, folks. Meant to post this over the weekend, but other stuff came up and I forgot (hey, Giz made me a Charter Member of Club Al). So, here the tools are for your perusal: 

https://www.makeuseof.com/tag/5-free-tools-fix-problem-windows-10/

Undoubtedly there are additional tools, and possibly better ones, but these are free and come recommended by MakeUseOf.com, a site that is pretty reliable, all in all. Feel free to add yours. There's also a link to antiviral/malware security software at the beginning of the article, and if you continue to scroll down, you'll find an article on the five best tools to repair corrupted/damaged files.

Before using the tools in the above article, do four big favors for yourself:

1. Update your drivers.

2. Create a restore point.

3. Do a backup to an external drive (redundancy encouraged) and

4. Try using the appropriate Microsoft troubleshooting tool.

For Windows 11 repair tools, here's a link...with the same provisos listed above.

https://www.makeuseof.com/windows-11-best-free-repair-tools/