WINDOWS 7 UPGRADE PROBLEM, PLEASE HELP

Hi, I am in Australia, and have a 64-bit HP DV7.  I filled out the application form to upgrade but when I put the model number in, it automatically chose wiindow home premium 32-bit - the problem is, it is greyed out and won't let me change it to 64-bit...I can't place the order as it's wrong for my operating system. Any help/ideas would be greatly appreciated.  Many thanks
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Hey there! I would contact HP Support directly regarding this. They may be able to get you the correct version.
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