Love my new Zune, but I wasn't able to install the software. Received the following error:

Installation Failed
Setup must stop because the required package ‘Zune’ failed to install.
DIFXAPP: Rollback failed with error 0x2
Error code: 0x80070643
http://go.microsoft.com/fwlink/?LinkID=101253

Looking at the support boards, it seems that a number of people are having this issue. I did find a reference to an obscure registry hack that disabled the installer's ability to rollback after a failed install. This seemed to fix the issue but I tried upgrading to the new 2.3 version of the software which recently became available. No go. Infact, the upgrade process failed and broke my previously working software.

Yuck! I once again followed the link in the above error message. It was of zero help. On a lark, I tried re-enabling the Firewall Service that I had long ago disabled. Fixed! Seems that you can turn your firewall off, but can't disable the service. Guessing the install was trying to configure ports on the firewall.

Zune: Great product. Zune client software: Poor QA.