The common Mothership Zeta "freeze"

[MrKickassL33T]

So everybody who has played Mothership Zeta experiences this Mothership Zeta knows about this infamous little 'freeze' that makes it to where your game is just stuck there. The 2 aliens on either side freeze while the 3rd one continues in a animation loop. I've had this probelem and was up all night pressing W and reloading saves to see if it would adventually work (which it used to on PS3) and now here on PC it never goes away. So I have 2 questions. 1. What exactly causes the script or whatever to do a freeze if anybody knows. 2. If I delete Zeta.esm how do I get it back?'

 

Thanks for reading and any help is greatly appreciated.