Hi People, thanks for your help. I had the same problem. After being prompted to update to iTunes Ver. 9.1 I went ahead and let it automatically update and install iTunes and Quicktime. After updating to Ver. 9.1, iTunes would not open or run on my Windows XP system. It would show up in "processes" as a running program but would not show up on my screen.
After reading your discussion about how Bonjour would interfere, I tried to uninstall it. It wouldn't uninstall because it is using one of the processes. I tried quite a few things including completely uninstalling all Apple programs and reinstalling iTunes. I manually uninstalled Bonjour. No luck!
+Here's what you need to do. After reinstalling iTunes, Navigate to the Program Files\ Bonjour folder and rename this folder Bounjour.Old. Restart the computer. Bounjour service should not now show up as a service in Administrative Tools\Services. DELETE the Bonjour.old folder. THEN go to Control Panel - Remove Programs and REMOVE Bounjour. It will now uninstall sucessfully.
After doing this iTunes started right up, loaded all my old settings, and recognized my iPod just like normal. Hooray and good luck.
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