I did some research and basically OEM is a ONE time use... that is tied to the motherboard it is installed with... and that makes it not favorable because if you want to upgrade the motherboard you have to reinstall another OEM OS fr 99$... or I could just buy the box version that includes liscense for like... 3 computers for 199$ so basically its moveable if I get a new computer... I am leaning towards the OEM though because I do not plan on upgrading my motherboard anytime soon ><