Just finished upgrading to Windows 10. Lightroom will not start. Windows says that an unexpected error prevents the opening and that I may want to choose another catalogue. Help!
It could well be a video card driver issue. Try disabling the GPU option in Lr. This document provides instructions Adobe Photoshop Lightroom Help | Lightroom Graphics Processor Acceleration (GPU) Troubleshooting & FAQ You need to use the 'Manually Disable the Graphics Processor method
Please copy the catalog file from the location where it is saved. Make a new folder on the desktop and paste the file in there. Double click on the file to open the Lightroom.
By default the Catalog is saved in the sub folder Called Lightroom which will be located inside the Pictures folder.
The Catalog file will be ending with .LRCAT