Needless to say I am completely befuddled by all this licence talk. I have an OEM copy of Vista Premium 64 which I bought off ebay about 6 months ago but haven't yet installed. I am close to building a new rig which I am intending to put this copy of Vista on. Can someone tell me in laymans terms whether MS will activate it or not, and will I be able to use windows update as per normal to download security updates etc. Note this is all I ever want, I have never once directly rung or emailed Microsoft for O/S support in any form, shape or other. Also, I do not plan to change mobos or anything for at least a couple of years, by which time I will almost certainly get WIndows 7 or whatever it is at the time.