I don't think anyone can guarantee anything about someone else's computer system. There are too many variables. It can also depend on where your tax data files are located. In Windows the default folder for the data files is the Documents\TurboTax folder. The files in that folder are not "supposed" to be affected by uninstalling, but it pays to exhibit caution. If you stored them somewhere else, you might have to be even more careful. Regardless, I would definitely make copies and back up all your *.taxYYYY data files (including multiple years if present) and also any return PDFs you made and store them somewhere such as an external drive or thumb drive--just in case. You should be backing them up somewhere anyway. I back up my tax data file frequently while working on my return since I have seen some anecdotes in this forum about tax data files going missing for other reasons.
