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    Windows 7 How to upgrade my windows 7 32 bt ti 64 bit?

    How to upgrade my windows 7 32 bit to 64 bit? I have a laptop that is perfectly compatible with 64-bit (I've verified it and I am very sure). I have installed a 32 bit version of windows 7. Now how to upgrade to 64-bit...? Remember, my installation dvd has no installation files for 64-bit...
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