im using my copy of windows 7 that i brought awhile back and its been on multiple motherboards and two hard drives due to upgrades and such, im installing it on my other pc thats half together so i can get it to boot into windows and i was wondering if i could use the same key, i lost the disk so i made another one using microsofts dvd/usb tool and its installing now. its not the oem version of the disk.