Change Windows 7 from 32bit to 64bit

Hello,
I have a Pavilion dv6 2005tx, with Windows 7 Home Premium 32bit.
How can I change the system to the same windows? but 64bit.
I mean without buy a new licence of windows... As a new copy comes with both, 32bit (that I already have) and 64bit, I don't see why I should pay extra if I already have the licence and I don't want upgrade to "pro" or "ultimate"
It is really disappointing and stupid that I bought a computer with 4GB of RAM and I just can use 3GB because limitations of the OS that comes installed from the fabric.
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We would be able to give you restore disk for the OS that was primarily ship with the notebook only...
Just Curious, why are looking for 64-bit OS, is it just the system memory part driving this? I mean, it is a lot of money buy a new license to gain few MBs of system memory...
Although I am an HP employee, I am speaking for myself and not for HP.
Make it easier for other people to find solutions, by marking my answer with 'Accept as Solution', if it solves your problem.
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Change Windows 7 from 32bit to 64bit

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