I was using it on Windows XP with no problems but my PC bit the dust and with it went my storehouse of recipes in the calculator. I now have a laptop with Windows 8 and downloaded the calculator and logged one of the recipes I had memorized. When I tried to save it I got an error message that said I didn't have permission to save it in the program and asked me if I wanted to save it in Lynda Folder. Not wanting to have to fill in all the fields again, I said yes but I can't find that folder anywhere. It told me I needed to get permission from the administrator to save the info within the calculator. Has anyone else encountered this problem???? I can't believe I lost all my recipes! I should have listened to that little voice that kept telling me to back up my files but NOOOOOO! I did not listen!