Itunes is running but will not open after most recent 9.1 update w/Bonjour

I recently loaded the most recent update for Itunes 9.1 version on 3/31. Since then, I have not been able to open my Itunes. I think it might be related to Bonjour because I see that it was added during my most recent update and I have never had it on my computer before. Now, i cannot get back into Itunes. I installed the update but when I double click on the itunes icon to open the file - I get nothing. The screen never shows up. Yet when I go to the task bar it says itunes is running in the background but there is no evidence of this. Help - I have been installing and reinstalling for the past couple of days with no luck.

I have three computers that are practicably clones of each other and the new itunes update failed on two of them but one worrked fine. Here is fix that worked for me. This fix was suggested by another member but I cannot recall or find his post. My system is WinXP sp3 with all the latest patches.
1. Download AirPort Utility 5.5.1 for Windows http://support.apple.com/downloads/
2. Open task Manager and stop the mdnsresponder process. The corrupted mdnsresponder will be using 50% of your cpu.
3. Open control panel / add remove programs. Find the bonjour app and click on it.
4. Note the corrupted version of bonjour 2.0.0.34 by clicking on the support link.
5. Uninstall bonjour
6. Restart Windows.
7. Install the AirPort Utility. This will install a good working version of mdnsresponder. Restart windows again.
8. Upon restart you will see a new the airport icon in your task tray. You can also find mdnsresponder.exe running under process in task manger with little or no cpu usage. Your bonjour app under add remove panel will now be version 1.0.106

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