Angela22 - I would like to say "go to your backup" but I guess that would be superfluous.
Before attempting any re-install of TurboTax (of which I have no experience) or any other prog, can your tax files be seen by any prog such as Explorer or using Dir in the Command Prompt window or by doing a Search for the file names/suffixes or any other program you can think of:-? If they can be found then they can probably be copied for backup to a cd or floppy, if your pc has such things. If your files have been deleted either to the Recycle Bin or using Shift+Del then you may still be able to recover them. If they are simply not accessible that's another matter.
Please advise some details of your pc such as Operating System (I have been assuming XP) and whether you have a cd burner and burning prog installed (such as Nero or Kerio) and whether you have a diskette drive. Also whether or not your System Restore feature is enabled.
Whatever, do
[highlight]not[/highlight][/b] install anything on your hard drive until we have exhausted all efforts to recover files.
Edit.1: Since posting above have done bit of searching and
this is just one of the TurboTax pages
Edit.2:
Here is the TurboTax forum, you might like to register/login and post your problem there. Don't forget to give some details of your Operating System, TurboTax version and post the entire error message you get. Someone on the forum may have the answer to the question "If I reinstall TurboTax will I lose data files?"
Edit.3: I note on the forum that there is the suggestion to update & install the latest TurboTax version so I
[highlight]guess[/highlight][/b] that this would not be promoted if a new install would cripple data files. Hmmmm!
Good luck & please let us know how you get on..