I recently mentioned a security hole in Windows, with a suggestion for disabling certain features of Windows to protect yourself. Since taking my own advice, I've had lots of problems working with photos on my computer (which really interferes with a project I'm working on), and have decided to take my chances and reactivated the feature. As I neglected to mention how to reactivate it (though the post I linked to had the information), just run the following command, if you also disabled the feature and are now having problems:
regsvr32 shimgvw.dll