i had the same problem. i found a simple solution - whatever browser you're using - stop.
1) download safari (for windows)
2) go to itunes website and download itunes from there
(every other browser errors for one reason or another, and i have them all, when you download through safari, it doesnt error it seems)
Hi ladymelbo... You're digging up some old threads unneccessarily. While Safari might work for you it seems Apple are no longer interested in its development, it hsn't been updated in nearly 2 years. For those looking to download iTunes at this time the direct download links in the further information section of Troubleshooting issues with iTunes for Windows updates might be more useful.