ITunes 10.5 invalid signature in running process

I'm running Windows 7 on a Dell.
I have tried several ways of updating the iTunes to 10.5, from iTunes directly, downloading from the website (by using IE and Firefox, and then I lost patience to try Safari, but I assume I would get exactly the same result), but they all ended up with failure since "THE SIGNATURE IS INVALID."
HELP!!! I've been struggling with this for like a week. I give a try every day but never succeed. I really want to experiece the new iOS system on my devices. Thanks a lot.

Had the same issue. Made me crazy.
Just found out that you need to sign in with your apple ID on de 'Home Sharing' section of your current itunes version. After that you can download and install all the apple software update again.
Hopefully this´ll solve your problem and bring back your peace of mind.
Cheers ,
JJ

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