Problem with auto-updates-macintosh

Hello. I have a macintosh. as you can tell. Well, my computer just started an auto-update for Quicktime, iTunes, and the Mac OS. It’s been about… half an hour and it’s stuck half way at the Quicktime update!!! I tried restarting, can’t. Tried X-ing out/ ending Software Update, can’t. So now I’m here, cable unplugged with three hours of battery left! So, can somebody please tell me how to fix this, instead of just letting my battery die and possibly lose some saved info? Thanks in advance!