On seeking advice from Adobe specialists I have twice reinstalled PSE 13, none of which have solved my problem. I understand that PSE 13 is not compatible with Windows 10 (although Adobe should have created a patch to ensure it is). I have read that by changing a file name this would allow compatibility. it's the file 'Set-up.exe' which needs changing to 'Setup.exe'. I have no idea how this can be done - perhaps someone does. In almost every photo is a '?' in the top left=hand corner. on the few photos that do not have the '?' they will print correctly so what can be done to solve this issue?