Could you please elaborate the issue more?
Which operating system : windows or mac?
What happens when you try to use Lightroom 6 ?
Does it crash or throw any sort of error message?
Im running windows 10
Its saying windows has encountered a problem and needs to close
Does it give this error as soon as you launch it or while editing?
Could you please share the crash logs so that we can get to know the cause of the crash?
Refer this link to get to the crash logs : Photoshop Elements Editor Help | How to Find Crash Logs on Windows
Adobe photoshop Lightroom has stopped working
A problem caused the program to stop working correctly.Windows will close the program and notify you if a solution is available.
Thats what its doing