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Level 2
February 22, 2026
Question

Unexpected Error

  • February 22, 2026
  • 1 reply
  • 10 views

I am trying to use TurboTax Premier via a Desktop download in Windows 11. Each time I load my TT program, a message entitled, Unexpected Error (no error number shown), followed by, "System.Runtime.Serialization... ."pops up. When I click OK the message goes away after a few seconds, and the program seems to open OK. However, while doing my taxes, just prior to the review section, when I responded to the TurboTax screen which said (paraphrasing), ...before we do a review let's check for updates... . At that point the Unexpected error msg popped up again, but everything froze, as in nothing works. I cannot move forward or back. I only hear a soft beep when I try to click on anything. I can use Task Manager to get out of TT and go back and start over again, but once back inside TT I get the same "Frozen" result each time. I am stuck and need help to resolve this error problem.

    1 reply

    SteamTrain
    Level 15
    February 22, 2026

    @Major5686 

     

    1) First reboot your computer

     

    2) then Try downloading and installing the Manual Update. Takes some time, so be patient

    Manually Update TurboTax for Windows Software

    ___________________________

     

    If that doesn't work, then you might need instruction's on how to repair your Microsoft Visual C++ installation.

    ____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
    Major5686Author
    Level 2
    February 27, 2026

    Thank you Steam Train. The reboot did not fully resolve my issue, but the Manual update link you provided carried me through to the finish. I appreciate your help very much. Major5686