I am using Lightroom 3 on Windows 7 platform.
I got the lightroom 64-bit stopped working message.
I went to the forums etc and got the following advice
Delete preference file: I did
delete catalog file: I did
delete .lock files
I uninstalled and reinstalled and got Lightroom 64-bit stopped working message.
Is there a fix to this?
Very likely there is a way to fix this, but since we don't know the root cause yet, it's just experimentation time. Here is a list of the steps mentioned as well as many others: Troubleshoot system errors, freezes | Windows | Adobe software