|If it rejects the code then you must have all ready installed the operating sytem...|
For all of MS operating system the product code is linked to the TYPE (version) of installation CD that is used....
OEM must have OEM COA
Retail must have retail COA
Upgrade must use upgrade COA
There is no way around this requirement. So check the installation CD that you used and determine what version it is as it is stamped into the hieroglyphic background of the original Microsoft installation CD.
If you are using a supplied disc from the manufacturer it is more than likely an OEM version...
The next thing to check is to make sure that you typed the code in exactly as shown...take great care in reading 8's and B's as they are sometimes hard to distinguish.
In reference to 11/05/2008
"So this is how liberty dies. With thunderous applause."
- George Lucas