Please help me itunes 8 wont load w/ invalid signature error

There has to be some sort of cosmic joker who is laughing at all of us. Perhaps the folks at Verisign are playing games with us or maybe it's Microsoft. How can there be a requirement to upgrade to itunes 8 when you purchase a new Nano and then not be able to do it because of an invalid signature error. I'm not the only one who has had this problem as I see it all over the web. I have tried it on another system sitting right next to this one (Win vista x32bit) and it didn't work either. I have deleted everything and updated win installer ver 4.5 and nothing works. The application wont run because of the signature error. I'm sure that the powers that be know what the problem is but dont want to release the fix because one side or the other hasn't been paid the appropriate money. It's always about the money. I have read every thread and suggestion that I could find but cant get it to work. If anyone has the answer please help me. I'm not a technotard and this is frustrating

I am afraid AFIK a clear cut solution for this hasn't emerged.
Are you trying to update with Apple Software Update. You might try repairing it from add/remove programs and trying again after a restart.
Have you tried downloading the iTunes installer from here:
http://www.apple.com/itunes/download/
Save the file on your desktop and run it from there.
I would clear your temporary Internet files and restart your PC before doing this.
If that doesn't work, maybe running the installer from your browser would work, although saving the file is usually best.
I have one report that a problem with a router causes this problem and that replacing the router fixed it, but in this case all downloads were affected.
It would be interesting to see if you can install the standalone Quicktime as a test. You can download it from here:
http://www.apple.com/quicktime/download/win.html
You want the version without iTunes, which is not the default.

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