This has been at least partially answered in several of the previous answers, but I think it can be generalized:
I believe this happens whenever you go to open TurboTax and you have ANY device plugged into a USB port. In my case it was an external mouse; in the case of others on here, it was a thumb drive.
I suggest you remove everything from USB ports, open Turbotax, and once the program is open you can plug anything/everything back in and continue as normal.
