Hi Julian, If your computer is hard freezing (requiring reboot), then there is probably something else on the system causing that conflict, or possibly even a hardware malfunction. For troubleshooting, you might try to uninstall and reinstall LR5.2, also you could reset the LR preferences as well. Resetting preferences: blogs.adobe.com/lightroomjournal/2013/06/lightroom-basic-troubleshooting-to-fix-most-issues.html#Preferences You might also try seeing if you can turn off unnecessary startup applications and services using Start> Run > type "msconfig", then press OK. This will launch the STartup utility. Head to the Startup Tab, and uncheck most everything here (for testing's sake). If it says Adobe, then perhaps keep it on, but most things can be removed in this list (and can be re-checked later as needed). Also goto the services tab, then click "Hide Microsoft services", and unchcek the non-adobe services as well from this list. This will put you in a "Selective Startup" over on the general tab. Hit OK, and restart the computer when it asks. Try Lightrom out again after doing some of that and see how it goes. Regards Pete
... View more