When I try and open any file I get the error 'Could not complete your request because of a program error' I have reinstalled PS CS5
and upgraded to OS 10.7.5 and still the same error.
Hi there! Because the forum you originally posted in is for beginners trying to learn the basics of Photoshop, I moved your question to the Photoshop Elements forum, where you'll get more specialized help.
To help others help you, pleaseread through this article and provide any additional relevant details.
Reset your preferences. Start PS and immediately hold down cmd option shift keys. Kind of tricky, but if fast enough you will get a reset window.