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Well I suggest PC Companion for updating as general. But now with the current situation, your phone is un-usable in this state, right?
It's totally abnormal for installation to take 24 hours, are you sure it's installing or still downloading?
Are you installing on PC Companion or Over-the-air?
First,try to go to settings-apps-all,look for the app called software update. Tap on it,force stop and clear data.
If not working,download PCC:
http://www.sonymobile.com/gb/tools/pc-companion/