I haven't been able to use my freshly loaded Adobe LR 4 64 or my CS5 64 (with the latest Adobe updates). I crash every time and if I suggest troubleshooting I'm advised to debug using the just in time debugger of Visual Studio. I've never had anything to do with this app, though it is in the bowels of my machine somewhere. Suggestions anyone?
Try following the steps below link and feel free to contact Adobe Support for the same.