so i updated lightroom today, and now it crashes on start up, ive restarted, un installed and

Hi Jon 

I did it and now LR opens... 

But when i want to load picture to edit, LR crash/close without any alarm or notification....

You could try deleting the pref settings. To re-set the prefs  hold  down the two keys Alt & Shift while starting Lightroom. Timing is critical, so keep the keys pressed for a couple of seconds while double-clicking the desktop icon or clicking the taskbar shortcut. When you release the keys you should get a pop-up dialog and you need to click the Yes button. The application should then launch.

N.B. this restores the default preferences so if you have any custom settings e.g. local storage, disk usage etc. you will need to update them again.