It says: Operation not permitted while System Integrity Protection is engagedGo to recovery mode and disable it : How to Disable System Integrity Protection on a Mac (and Why You Shouldn’t)
Now after the restart I used this command: launchctl unload -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
This killed the notification centre. Then I used a program called CleanMyMac to uninstall notification centre.
On your destktop hit: SHIFT+CMD+G this will bring up a search: type: /System/Library/CoreServiecs
Here is the Notification Centre app. I did right click, services, uninstall with cleanmymac. If you don't have claenmymac you can just drag it to the trash. Delete it restart and the notification centre is gone only it's icon remains in the corner.
IMPORTANT: this might allow malware and viruses to permanently damage your computer!!!
The only way to do this safely is to save all your data on an external. Reinstall the system and wipe your hdd. Clean, out of the store reset. Now when you launch the computer for the first time, don't even connect to the internet!!! Disable, uninstall, reenable. How to do the clean install http://fieldguide.gizmodo.com/make-your-mac-feel-like-new-again-with-a-fresh-ins tall-1697926482
I recommend doing this. I have a macbook air late 2010 and the notification centre just killed it. Now that I disabled it it runs smooth. It takes a lot of RAM. If you don't want to do this process just click on Not. Centre, edit on the bottom and remove all the crappy add-ons like stock that always refreshes in the background and in the preferences disable all apps that you don't need. + you can put in in do not disturb mode so it won't try to eat your ram. Hope it helps.
DONT FORGET TO REANABLE THE SYSTEM PROTECTION. And no wifi until you are done.