i didnt think OEM was legally bound to the machine it came with, just that the OEM supplier is responsible for any support or maintenance from that equipment.
as for disks, media isnt often supplied with pre-installed software these days, although i would expect some utility to make your own, which could possibly be a complete disk image which is most likely bound to the make and model you bought.
i still think if you have a licence key, possibly stuck to the base of the laptop on an official hologrammed Microsoft sticker you can install that software within licence terms on any machine - as stated above you can usually install on 2 machines as long as not using both at same time.
if you are in a real bind, i could probably get you a copy of the media, its useless without a legal key though