My pc does not allow me to download itunes or quicktime because it says that there is an unvalid signature...

regularly Itunes tells me that there are updates for itunes, quicktime or safari or something else but when i try to download them the computer tells me that there is a not valid signature and it is not possible to install the update.  what can i do?

Same problem- I literally cannot sync my new iPad with iTunes because I cannot download iTunes 10.5 or QuickTime.  I have tried everything including connecting to wired connection, turning on home sharing, and re-installing iTunes. Please help- it is making me crazy. I am running windows 7 on a new(a few months old) toshiba.

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