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Yes you can easily change the installed product key through the windows activation screen (which can be accessed by right clicking computer , then going to the activation section at the bottom and pressing "Change my product key")
And no , you dont need another brand as HP is a major OEM and theres no doubt that , just like vista , major oem slp keys will be leaked when windows 7 starts shipping on new computers (October 22nd)
Regards
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