I recently purchased Windows 98. I received the CD with the OS manual. I was able to install the OS, but when the system asked for the product key, I eneterd it as mentioned on the book. I got an error message as an Invalid product key. I checked back with the online vendor and the person said that it was a valid CD that they had sent to me. Is there any suggestion as to what I am supposed to do. My question is to first find out if this a problem with the CD or is there some kind of a fix for this error.