started my 21 taxes in February and today found my return has disappeared

I downloaded TT21 from Costco an I started my 21 filing in early March.

When I went to finalize it today TT could not find my previous work!  

Then  I tried to start my  21 filing all over again  but TT could not find my 2020 return data.

My TT21 software was purchased/dowloaded from Costco.

I have tried to locate   .tax  files on my PC but cannot find any from the last 5 years!!!  Has anybody had this problem???