MR_Hemura
Lissen...I had this same problem...a while back and its not your CD key...its your E-Drive...I would tell you more...but i wish i knew...all i know is that there is something wroung with your e-drive...not with your CD key........
Your E: Drive is your cd-rom drive. So if it says there's something wrong with your E: Drive, then it's a problem with the disc, usually not the drive itself. If other discs are working fine for him, then there's nothing wrong with his E drive.