I've lost my windows operating system CD?

Answer Not if your version was an OEM copy.If it was, then the registration key will only work on the copy you lost.It will not work on another copy of W 7.

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How do I go about changing my windows XP operating system to Windows Vista Im upgrading my whole system.?

Hi,don't do it stick to XP Pro with SP2 it's still the best OS.

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