Hey there, @ComputerCD.

Thanks for reaching out to the Community for support and sharing those great details about your installation issue. 

I wanted to clarify if you've tried installing on this computer in selective startup mode? If not, let's give that a try. Selective startup is there when you're having issues installing or uninstalling a program. I've covered some steps to do this below. 

Start your computer in Selective startup mode:

To make sure no other application hinders you from completing your task, switch to Selective startup mode. If you're uncomfortable doing the steps, consult your computer's manufacturer, Windows expert or professional IT.

1. On your keyboard, press Windows+R to open the Run command.
2. Type msconfig, then select OK.
3. In the General tab, click on Selective startup and Load system services.
4. Go to the Services tab, then hit Hide all Microsoft Services.
5. Select Disable all.
6. Uncheck the Hide all Microsoft services checkbox.
7. Make sure the Windows Installer checkbox is selected from the list of services. If it’s not, select the checkbox.
8. Click on OK.
9. On the System Configuration window, hit Restart.

Then, you'll want to try Installing QuickBooks again.

Once you've successfully installed QuickBooks, be sure to go back to Normal startup.

Here's how:

1. On your keyboard, press Windows+R to open the Run command.
2. Type msconfig, then select OK.
3. In the General tab, click on Normal startup.
4. Tap OK.
5. On the System Configuration window, hit Restart.

For additional details about this process, check out Install QuickBooks in Selective startup mode.

Please let me know if you have any questions or concerns. Take care and have a great day ahead!