iTunes 9.1 on Windows 7 (x64) fails on update

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Perhaps like me, you accepted the prompt when iTunes notified you that 9.1 was available for updating on your Windows 7 (x64) computer. After the rather large download though, the installation failed. Trying again later ended with the same results. I found some reports of this occurring on 32 bit Windows 7 and on Vista.

From what I could gather, it appears to occur due to a conflict with the version of Bonjour that is already installed. (Bonjour is Apple's service discovery protocol, and is used by iTunes to find shared music on your network.)

I was able to successful perform a manual update.
  1. Download iTunes 9.1 for Windows (64 bit)
  2. Close iTunes
  3. Run the install
When I ran the install, it reported that my version of Bonjour was newer than the version within the install package, but it didn't cause any issues. (Note, I had previously installed the Bonjour Print Utility in troubleshooting a previous problem with my wireless modem and Apple TV. That fix ended up needing a firmware upgrade in my wireless modem.)

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