You have to be much more specific and provide the relevant technical information - What system? What image files? Where are the files stored? What version of PS? ...and so on.
so, it is PS CC, the trial version, the photos are JPEG and I've tried with the externalmemory and saving them on the desktop. And as long as I'm not good with computers at all, for system, do you mean Windows 7, or what else? Thank you
Try resetting preferences. Start PS and immediately hold down ctrl/alt/shift keys. If fast enough you will get a reset window. If you see splash screen you are too late.
But it appears just a window asking me if I want to delate the file of the settings of Adobe Photoshop...I've tried both choosing Yes and No but nothing changes.