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Quote ""Lightroom - Opening Catalog: DSC_3768.dng.lrcat"
You have inadvertently created a Catalog using the name of an image file namely DSC_3768.dng. It is recognized by Lightroom as an invalid format and cannot open. Use your OS via Win Explorer or Mac Finder an go to the Lightroom sub-folder where your Catalog files are stored and double click on a previous Catalog file and Lightroom should boot with that Catalog. If this solves your problem the you can remove the offending folder DSC_3768.dng.lrcat"
It may be a good idea to view the video at the following link before you proceed with the above.
See the screen capture of my Lightroom sub-folder, Win 7.
Thank you for your reply! I have viewed the video and tried opening the LR3 catalog and yet it still tries to open this "DSC_3768.dng.lrcat" file and crashing. I have searched the computer and can't not locate this file. Any other ideas/tips?
Here is a screenshot of what it looks like: http://i22.photobucket.com/albums/b345/sweethaley18/Computer/lightroomerror_zps52bb9cb3.pn g