About a week ago I updated my Zune software to version 2.3. Unfortunately for me, the install failed and I could not use the Zune software for anything where I needed to login. I struggled for days to try to resolve this issue. Then two days ago I found a blog that suggested to turn on my Windows firewall during the installation process. I have no idea why the Windows firewall needed to be on but it resolved my installation issue.

Zune version 2.3 is installed and running happily on my Vista laptop!!