Photoshop :: CS6 Won't Open Images - It Says It Can't Find The File

this morning photoshop decided to play up and any new images that i try to open to edit, i get this message. 'Could not complete your request because the file was not found'.    The same problem occours with all file types except .psd files. I have tried uninstalling and reinstalling photoshop with no luck.
 
And incase its relavent, each time i click open the 'enable:' option is blank and 'Format:' is set to photoshop by default. With these settings all files in my finder and greyed out, so i change 'enable' to all readable documents which ungreys them. But when i open them, i get the message mentioned at the start.