As soon as I click on "preferences" , I get an error message and LR shuts down.
I uninstalled and reinstalled without any improvment.
I use a PC with Windows 7.
Does anybody have a solution?
What always helps is to know exactly where the problem occurs.
Could you give the Event Viewer a look?
If you run "eventvwr.msc /s" (you can type it in in the run input field on the start menu)
Look into Windows logs/Applications