@anvilwest - I apologize, I should have been more specific on which troubleshooting step to use. Although you have had no major changes to your computer, something is blocking TurboTax from opening and running. It could be an anti-virus update, a firewall, some other program running in the background, or something related to an update, or something related to user rights (something that Windows 10 is stricter on than past OS's).
We recommend you check to make sure you're set up to run the program as the Admin. Right click on the icon, then click on "Properties". Form there, click on the "Compatibility" tab. Click to mark the box "Run this program as an administrator". Finally click "Apply" and "OK". You can try to open the program again after that, if it still won't open for you please try the link below to reboot into Selective Startup. This allows Windows to only run the critical programs so that any program that may be blocking TurboTax isn't running.
<a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/1901330-start-windows-in-selective-startup-mode">https://ttlc.intu...>
If you would like to contact us for assistance with going into Selective Startup, please use the link our SuperUser provided above.
