Archived from groups: microsoft.public.windowsxp.basics (
More info?)
"spudnik282" <spudnik282@discussions.microsoft.com> wrote:
>I've been staring at my damaged windows xp pro oem version cd and wondering
>how the COA product key works. Its been awhile since ive installed windows
>from scratch and never really paid attention, I'd just enter the key and be
>done with it.
>
>The original disc is damaged and I have a new oem one on the way. From what
>I've reasearched as long as the disc is an oem version it will work with the
>coa that i currently have. Why is that? Does the key not really matter until
>the computer connects to the internet/800 number to verify or what?
>
>Its just something that got me thinking.
>
>Thanks
>Adam
Here is how the Product Key works, at least insofar as I understand
it.
Validation of the product key is a multiple step process.
1. When the 25 character product key is entered, the first check is
to see if the values entered are valid. Certain characters in the key
(I am not certain how many - it could be 1, 2, or perhaps 3) are check
codes. That means that their values are determined by means of a
specific formula that uses the other characters in the key to
determine what thes check code should be.
2. If the overall key is valid then it is further checked to see if
it is valid for the specific type and version of the product that is
being installed. Another formula is used to calculate a product type
and version code and this is compared to the information on the CD to
see if they match. At the highest level, this means that a product
key for Microsoft Office cannot be used to install Microsoft Windows,
and vice versa, but it goes much further than that. Product Keys for
Windows XP Home cannot be used with Windows XP Pro (also vice versa)
and Product Keys for OEM versions cannot be used to install retail or
volume licensed versions (also vice versa).
3. If the product key is valid, and it is for the correct product,
version, and type then it will be installed. As part of the
installation process the data used by Windows Activation is generated,
based not only on the product key but also on certain specific
hardware items found in that computer. When the online activation
center is contacted this activation information is checked against the
existing data stored at Microsoft. Three possible situations can
occur at this time:
a. The product key may be for a BIOS locked OEM version of Windows,
in which case online activation will be refused. BIOS locked OEM
versions are self-activating if the BIOS is correct so it is only if
the BIOS does not match (e.g. motherboard replaced) that BIOS locked
OEM versions will request activation, and these situations now require
manual activation by phone, and this activation may or may not be
given.
b. The product key may have been previously activated. In this case
the hardware identifiers are compared with those from the previous
activation and if they are the same then the activation will be done.
If the hardware identifiers are different then a telephone activation
will be required.
c. The product key may have never been activated before, in which
case the activation will be done and the activation identifiers
(product key and hardware details) will be recorded at Microsoft.
Hope this explains the situation.
Good luck
Ron Martell Duncan B.C. Canada
--
Microsoft MVP
On-Line Help Computer Service
http://onlinehelp.bc.ca
In memory of a dear friend Alex Nichol MVP
http://aumha.org/alex.htm