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It is very easy to use more than one operating system in one laptop.For that install window xp in your laptop.After total complete of xp installation restart your laptop.Now Enter your window 7 CD into drive,it will automatically boot,When it try to install window 7,first it will firn your window xp,and alert you for that ,now it will give you option like live with current operating system,choose this option it will install window 7.
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