I know I have a non genuine copy of windows 7 ultimate 64 bit and my computer is sluggish and black screen as the screen saver with the right hand corner non genuine message. I want to buy a genuine version and have been advise it is best to buy the disk. I had a genuine version of windows 7 home premium before my computer crashed and needed a new hard drive and got help from a friend to do this and the windows install..when I buy the new version will I just enter the new product key? Just need advice on what I actually need.
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