kmuller - The antivirus change solved my problem with tax year 2021. However, it did not solve the problem with 2020. For 2020 I have been able to use the "Save As" command and overwrite the old file. Thankfully, I do have one Windows 10 machine in my office that is able to function for now. We really need a proper solution from Intuit that will allow us to use our current equipment. At some point, the Windows 10 machines will not be available.