Invalid signature prevents update, unable to install without it

When I try to install Itunes 10.1 from Apple software update on my Windows 7 64 bit machine, I get an "invalid signature" message at the end of the QuickTime downlay and the download aborts. When I download Itunes64Setup.exe from the website, it aborts within a second or two.
I have tried every conceivable solution on this and other websites to no avail (deleting and reinstalling using Windows Install Cleanup and Revo Uninstaller, deleting files directly, changing the options in Internet Explorer, updating Software Update to the newest version, and too many others to mention). I even reinstalled Windows from the DVD. I even spoke with a friend who works as a "Genius" but nothing we tried
I have been able to install QuickTime 7.40 from the standalone file, which gets me back Application Support and Software Uptdate, but Software Update does not work at all and but there is no way to get Itunes back, Since I deleted the prior version of Itunes, I can no longer sync my ipods, Ipad or use my Mobile Me account, no less upgrade to the OS when it comes out next week. I am desperate.

Well, yours is the first I've heard this happening with a wired connection! Had to look up FIOS, no one else has mentioned a fiber optic connection, either.
It's no consolation to YOUR dilemma, but millions of folks are getting the download OK and it DOES have a valid signature.
I've read posts about resetting security certificates, changing router settings, yadda yadda yadda. Seriously it will probably be less time spent trying to troubleshoot, if you just get it the setup files from a friend who has successfully installed itunes/QT.

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