I'm looking for a system operator windows(7,8,10) for my first ever custom build gaming!! I finally build one! I installed my old windows 7 but the product key was invaild(I used my windows 7 for my old gaming laptop that used windows vista and since I didn't have windows vista I bought 7. Since my laptop I bought was pre-owned but didn't include vista) I tried installing window 7(failed again) I called in Microsoft ( thinking I could get a phone activations) they said it was a upgrade vision and I couldn't install it. So I wanted to buy a new fresh window for my custom pc. (I installed my old windows 7 and skip the product key. Will this effect my future windows?)