I have changed from 32 bit pc to 64 bit and can't open my previous catalogue, I get an error message saying catalogue might be open and used with another programme (which it isn't) or I might need permissions..............any Idea's.
Only the obvious: make sure another instance of Lightroom process is not running.
Look in the folder alongside your catalogue. If there is a file named <catalogue name>.lock, delete that file and try again to run LR.
Or tell us exactly what the error message says? My ears pricked up at "I might need permissions"
Thanks Victoria it was a permissions problem.
It was a permissions problem Rob.
Thanks for replying.
Retrieving data ...