Is there any reliable software to restore corrupted psd files and what could be the reason for this to happen? After the restart my photoshop started with some recovery psd files opened and everything else was corrupt... I read that there are people with similar problems, but no one reported all of their files corrupt...
It sounds unlikely that multiple PSD files have become corrupted. My first thought when seeing the thread title was a bad Windows FAT (File Allocation Table) but even that sounds unlikely to only affect PSD files. So I'd be looking at the common denominator, which is Photoshop. Have you tried creating a new document, and saving and reopening?
I think I'd try opening the files with another app like Irfanview, or just reinstalling Photoshop. Do you have the files backed up?
BTW I meant to say that we rarely hear of PSD recovery apps being successful.