Andrey
Andrey,
Thanks for the suggestions. I ran the recommended tests with no errors showing up. Following is a shortened version of the results; cleaned up to save space. I show the command and the end results.
C:\windows\system32>SFC /Scannow
Windows Resource Protection did not find any integrity violations.
C:\windows\system32>Dism /Online /Cleanup-Image /CheckHealth
No component store corruption detected.
The operation completed successfully.
C:\windows\system32>Dism /Online /Cleanup-Image /ScanHealth
No component store corruption detected.
The operation completed successfully.
C:\windows\system32>DISM /Online /Cleanup-Image /RestoreHealth
The restore operation completed successfully.
The operation completed successfully.
I thought I’d try something. I ran Everything and saved the results for just the few minutes after trying to install Tonfotos. It shows every file modified as shown below.

Most of these files are not related to SquirrelTemp, and most that I checked required permissions I did not have. One that looked useful is Report.wer; and I would like to send it to you. It is 140 lines long and seems to point to KERNELBASE.dll. Also, the folder ReportArchive, contains the “Reort.wer” for several/all instances where I encountered this problem.