Make sure you check for "Windows" updates before installing TTX. Any waiting updates will block TTX installation.
Check for any, the reboot anyhow, no matter what...and try again.
........AND Make Sure you rt-click on the installation file and "Run as administrator" Don't just double-click on it
_______________________
Beyond that
Work with Customer Support on the phone:
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
I did all that, and then I unregistered and re-registered the Windows Installer service (and rebooted again), that did the trick.
Hello. I looked at the solutions regarding this problem. Thank you for the tip on right-clicking as an administrator. After doing this I was able to move forward, however it took 5-10 minutes for the install to finish.
For years the startup of TT has been frustrating. The absence of progress bars at some stages, coupled with mega-slow installation makes one think the process is hung. No clue as to why they don't fix that!!!
The entire process with updates just took about an hour! Some of the advice may be good but I'd just recommend great patience. If you think it's hung, go out for a long walk.
This works fast on my Windows 10 PC and possibly will work with Windows 8 and 11, according to the original source.
1. press CNTRL+ALT+DEL and open the Task Manager.
2. click More Details in the bottom left corner.
3.On the processes tab, click to select Windows Installer under Background processes.
4. Click the End Task button (it's down at the bottom of the page).
5, Install TurboTax again.