I need my 2017 AIG and tax return because now that I have submitted by 2018 return, I can no longer find of access my 2017 return. Also CANNOT LOCATE 2017 AIG ON RETURN

My TurboTax is always put on my desktop screen, for all years that my computer didn't have to be wiped clean. If yours isn't there go to the Start menu and it should show all program files that you have used recently. Select the year of TT you want and click on it. If TT-2017 isn't current, then click on "All Programs" and see if that brings up your TT-2017.  The 2017 TurboTax AGI is located on line 37 (first page) and line 38 (second page).