Maybe you need to update the program? Go up to Online-Check for Updates. At least that's where it is in the personal Desktop program.
I found these 2 FAQ
Windows can not save file
Windows error 131 Saving
Thanks much for your reply. FYI I purchased product off the Intuit Turbo Tax website.
When attempting to save files to the "Documents" folder a pop-up box appears reading "Unable to Find File". Although TurboTax tech support agent was unable to fix the problem; in the process of troubleshooting we found that the same "Save As" command is able to save the files on my "Desktop" (Only). Am running Windows 10 on an HP PC.