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W0lf93
It verifies that you have sufficient privileges to stop system services which may occur when attempting to update TurboTax. This might be a reason why background processes slow your computer down, or a defect in the Microsoft .NET files on your system.
Diatonic254

Below is a list of the several causes of runtime error 1921.

1. Incomplete or corrupt download of TurboTax software.

2. Virus infection that has corrupted Turbo or windows system files.

3. Another program mistakenly deleted TurboTax-related files.

4. Corruption in windows registry.

Error 1921 can be caused by other factors. Therefore, it is recommended to run a troubleshooting procedure for each of the possible causes. In addition, you can close all running programs including TurboTax and restart your computer. This will probably fix the error.


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