Antivirus removed for the second time.

I have a problem.
The first time, Norton removed it self from my computer due to my nephew randomly slamming his hands on the keys. Fixed it with the removal tool and downloader tool.

HOWEVER, It happened AGAIN today when I attempted to do a system restore. First, my Action Center said It wasn't up to date,so I decided to do another system restore. And then it removed itself again. I tried to use the removal tool to fix the problem, but for SOME reason, I keep getting a dead link when I attempt to get the removal tool.