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First, try to run the program as an admin > right click on the TurboTax exe file and select "Run as administrator".
If that doesn't work and you're using Windows 10, try this solution:
If you're using Windows 7 or later, here are 3 more potential solutions:
Run the Windows System File Checker, then try updating again.
Re-register the Windows Installer: Click Start > Run > type MSIEXEC /UNREGISTER > click OK (it'll look like nothing happened). Then do the same thing except this time type MSIEXEC /REGSERVER. Now try updating again.
Start the Windows Installer Service:
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