ITunes won't open after QuickTime update (Windows XP)

Hi all,
Yesterday I was prompted by Apple Software Update to install the newest version of QuickTime, and I always comply. However, after the update now iTunes will not open at all! No error message, just the hourglass cursor for a few seconds to indicate that it's loading, then a regular cursor... and then nothing.
I tried connecting my iPod Touch since it's configured to auto-sync upon connect, still won't open. I then googled the problem and came across some methods that I don't want to try just yet, since they involve reinstalling iTunes. Also tried uninstalling Bonjour from the Add/Remove Programs menu, but this apparent solution did not work either.
I run Windows XP Professional Service Pack 3 32-bit. This started happening after I updated to QuickTime 7.7 (from 7.6 I believe). Is there a fix for this problem without reinstalling? If possible, I don't want to lose my library settings. Thanks!

Could you check something further for me please, df? Is your QuickTime Player also currently failing to launch (with or without an error message)?

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