i have a window 7 OEM on (at least i think i have OEM cause it show OEM on the activation key or product ID) i have i3-2100 and i'm planning to upgrade to a i5-3570k (using my PC for gaming and other programs like after effect,etc and normal use to like internet browse DUH!) will there be any problems? since this is a OEM or do i need a retail version of windows? thanks in advance.