'this installation package could not be opened. verify that package exists and you can access it or contact application vendor to verify that this is valid windows installer package"

this error  comes up   everytime i  try to install  itunes  or any apple  product in windows 7. I have  verified everything  with  windows and its registered  and still there is no success.

If you are not already doing so, install from an Administrator account.
If you haven't already done so, download the iTunes Installer from:
http://www.apple.com/itunes/download/
Then right click on the installer and select "Run as Administrator." (Even though you are using an admin account).
If that doesn't work, try creating a new administrator account and installing from there.

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