SUCCESS!
After much effort by yours truly had still not quite figured out the last step, getting Parallels Tools installed, I waved the white flag and requested help from Parallels.com tech support. A fantastic agent Nabiil G. came in with a remote screen control session, and after a bunch of steps in various methods, he eventually honed in on Micro$oft's Bitlocker, which I think is also referred to as TPM, and suspected it was preventing the Parallels Tools installer from running. He found a way to turn off Bitlocker, and got Parallels Tools installed on the VM, and it's now up and running flawlessly. Thank you, Nabiil!
The following was his "post mortem" summary of what all was done!
Hello,
Thank you for your time and patience.
Kindly find the summary of our remote session below:
1. Create a new Virtual Machine as a test
2. Boot your old hard disk virtual machine in the test Virtual Machine.
3. Install Parallels Tools on the new machine.
4. Once the installation has been completed, we did open the old virtual machine and the Parallels Tools was installed successfully on the old machine.
5. Test the applications which was installed on the old virtual machine.
6. Everything is now working properly.
Since your issue has been resolved, we are now proceeding to the ticket closure.
We are very glad to assist you in resolving the issue you encountered.
Please do not hesitate to contact us if you have any question or issue.
Have a nice week and enjoy using Parallels Desktop!
Best regards,
Nabiil G.