Not sure what you mean by beat? You can sort of beat the Zombies in Origins by doing the EE. If you want tips on how to get better maybe have a look at searching for Zombie tips. I found this post from a while back by doing a search for "Zombie tips" on the Zombie forum home page. Re: Basic Zombie Tips To Becoming A Zombie Pro Needed!
The search is pretty good so have a look at it. There has been a lot of good posts on doing the EE, quick high round strategies and I think starting strategies.
II'll say it again, increase your sensitivity. Gradually move up to 13 or 14. You will be able to look behind you faster, and that's where all the problems generally occur.
AAlmost forgot. When you receive a notice saying "script error" or "animation error" you won.