"Invalid Signature" preventing update to iTunes 10.3 in Windows XP

When I try to update iTunes to 10.3 on my Windows XP system with the Apple Software Update application, I get a pop-up box saying "iTunes has an invalid signature. The download has been removed".  This happens whether I select install or change to download only.  How do I get around this problem?

Follow these instructions to completely remove Apple software
http://support.apple.com/kb/HT1923
Then use free Ccleaner to repeatly repair your registry until it's fixed.
http://www.piriform.com/ccleaner/download/standard
download iTunes again from Apple.
http://www.apple.com/itunes/
If you have 64bit Vista or Windows 7, look for the seperate download of iTunes for that further down the page.
Once installed, use the Apple Software Update under your Start Menu to fully update all Apple components.
Your content will remain on the drive in the Music > iTunes Folder, nothing is deleted.
You should be making backups of your content regularly, either through iTunes or via copying the iTunesFolder in your Music folder to a external drive.
Windows is notorious for having "other" issues that make it unstable, we as volunteers helping others can't always resolve those issues.

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    Hello, I was trying to upgrade my iTunes for windows 7 PC, but because of invalid signature error I removed iTunes as well as all apple related applications. While reinstalling it , When I click link to install iTunes it immediately says '' thank you for downloading iTunes'' but I don't find it in my system.
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    Download/install an app is a know possible solution.
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    I have the same problem.  Emailed apple--no help

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