When I had this issue a year or two ago, I had already been using the Turbo Tax for that year. Then one time I opened it, it said I had to enter my license number and it gave me the error code 630. Called Turbo Tax, talked to a few levels of help desk people, no luck. Got new license numbers from Turbo Tax, no luck. Then I saw a post that said that even though you "uninstall" the software, some of the files are still there and you need to delete them manually. It said where the files were on the hard drive (I think 3 files maybe?). I had to go in and manually delete the files off of my hard drive. Reinstalled the software and it worked. It was unbelievable that no one at Turbo Tax could tell me that.
