An error 70001 in TurboTax usually indicates that the desktop software believes another program is already running or there is a, user account/permission conflict.
To resolve this, immediately restart your computer, ensure no other TurboTax processes are active in Task Manager, and run the software as an administrator.
Try adjusting your firewall protections.
If this does not help you can uninstall and reinstall the program. How do I forcefully uninstall TurboTax for Windows?