Lightroom 3 is not opening after trying to import a .JPG file a couple weeks ago. Lightroom stalls and the following error message is in a speparate box on the screen: Lightroom - Opening Catelog: RyanStewe_150.jpg.lrcat. A technician who looked at the computer indicated that it appears lightroom 3 is trying to boot up a catalog that does not exist or is not corrrect. Help!!!