Contact your computer's manufacturer and tell them you purchased this used computer from someone & the Windows has not been activated & Windows Product key is unreadable. They will ask you for some basic information and send you the windows activation code. This happened to me last month actually. I bought a new Toshiba netbook for work and when I received it the windows 7 was not activated yet and the product key for activation was in such bad shape I could not even read one single letter/number. Just follow my lead and you should get what you need. Contact your computer's manufacturer. I sent Toshiba an email because I didn't want to be put on hold for hours.. You might want to try calling if time is important. Good luck bud!