ITunes 7.1 won't start, invalid Win32 application error message comes up

I repeatedly tried to download iTunes 7.1 for my new iPod nano on my Windows XP, when the download completes and I try to run the program an error message comes up stating that iTunesupdate.exe is not a valid Win32 application...I have tried erasing iTunes completely then re-downloading it, tried re-intsalling but nothing works. I have been trying to get help for the past month now, no one seems to know anything, this is the last resort please help ASAP.
Thanx a bunch.

okay, let's give this document a try:
iTunes: Windows reports that iTunesSetup.exe is not a "valid Win32 application"

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This seems a very popular topic of discussion and I am now feeling the frustration of many. I am trying to download itunes 10.5 to use my new iphone but I can only get so far then I receive this message
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1. Go to Microsoft website to fix install and Unistall problems. Click "Run now" from Fix it to remove all iTunes & related installer files:
http://support.microsoft.com/mats/Program_Install_and_Uninstall
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it may be necessary to remove all traces of iTunes, QuickTime, and related software components from your computer before reinstalling iTunes.
Use the Control Panel to uninstall iTunes and related software components in the following order:
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QuickTime
Apple Software Update
Apple Mobile Device Support
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Apple Application Support (iTunes 9 or later)
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B-rock

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ITunes 7.1 won't start, invalid Win32 application error message comes up

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