k, time for a quick tutorial.
First, uninstall XNA 3.0 Final
Go to Start > Run, enter appwiz.cpl and click OK. Uninstall XNA Game Studio, the XNA Game Studio Platform Tools, the XNA Framework Redistributable, and Microsoft Games for Windows - LIVE Redistributable (preferably in that order).
Second, install XNA 3.0 Beta
Get it here:
http://dl.getdropbox.com/u/347522/Zu...3.0%20Beta.exe
Lastly, open up and unpack ZuneHero
You all know how to do this already, if you're getting Error 2160
After this, uninstall XNA 3.0 Beta and re-install XNA 3.0 Final to get the newest games. ZuneHero will stay on your zune.