My friend needs a new hard drive for his laptop. I am replacing my hard drive in my laptop with an SSD so I was wondering if I could just put my old drive in his laptop. My laptop is an HP with an AMD processor and 8 gigs of ram, and his is a Dell with an intel processor and 4 gigs of ram. If that is not possible, and he was to buy a new drive, would he need to purchase a new copy of windows since he does not have the installation disk? Any help or advise is greatly appreciated.