No. Illegal as it is, it is nearly impossible to find a non-register version.
If on the side of the computer case, there is a Windows sticker with a number on it, there is hope for you yet. With that number you can ring Microsoft and get a CD. This only occurs when the computer was sold with windows pre-installed, or OEM.
If there is no sticker, I suggest you contact the person you brought, they SHOULD have a copy of the disk, if not. Demand them they get you one, or unlock the user account.
Sig reinstated. SigSanta