This might now help but anyways try Java Forums for such complicated issues....
http://forum.java.sun.com/forum.jspa?forumID=32
I have a new Dell inspiron 1564with windows 7 pre-installed.
I get an error message when I try to install iTunes or java update - "This 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." I googled it and it seems to be common bug. How do I fix it?
Your help would be greatly appreciated.

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