The installation package could not be opened. Verify that the package exist

HELP!
I have not been able to update my Itunes to a newer version (since 6.0.5). Every time I try to upgrade to the newer version I get this error message when I try to install:
"The installation package could not be opened. Verify that the package exists and that you can access it, or contact the application vendor to verify that this is a valid Windows Installer package"
This is been incredibly frustrating because now I am limited in what songs and albums I can buy online because they require the newer version. I am getting to the point where i'm ready to start using another service to get my music from now on. I've noticed that others here have the same error message, but they are using Windows Vista. I'm having this problem on Windows XP.
Any help would be very appreciated.

Oh sorry what i meant was that i am trying to install adobe reader, i have tried all version from 8 to 9 and i am getting this error.The solution that i found on different forum was to use windows installer cleanup utility and clean up the previous installation. i dont have any installation in my registry.
Kindly help me in this matter

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