Do a Repair Install  Specialized  information for using OEM XP Pro 
CD to change "Corp" VLK Product Key. 

Repair Install

Retail Pro XP full CD use the step by step link  to change 
"Corp" VLK Product Key:

Retail XP Pro Repair Install step by step
http://www.michaelstevenstech.com/XPrepairinstall.htm

For OEM XP Pro CD:

   !! Before running the Repair Install below; make sure you read and 
   follow the steps for preparation located in the Retail Repair 
   Install (http://www.michaelstevenstech.com/XPrepairinstall.htm) 
   step by step link above. You need to backup important data 
   and remove spyware, malware, and scan for virus before doing the 
   Repair Install.

   OEM XP Pro can be used to repair install a "Corporate" VLK XP, but 
   it must be run from Windows.  When booting from the OEM XP Pro CD 
   the repair option is not available. To get the option to 
   Repair Install follow the steps below.


1.  With Windows XP running.


2.  Insert the OEM XP Pro CD.


3.  Select install from menu.


4.  You will get the warning message that upgrade is not available. 


5.  Select "new installation" and specify you want to choose the 
    install partition after reboot. 

6.  Reboot 

7.  After reboot, setup will copy files to a temporary location. 


8.  At the first setup screen; press "Enter",  
    [do not choose the "R" option]

9.  After you accept the license agreement, the  option to Repair  will 
    be offered.

10. Proceed with Repair Install

   It is unlikely the repair option is not offered in step #9; but if 
   it isn't and you choose to reinstall, you will lose all information 
   in the "Windows" and "Documents and Settings" folders. All information 
   in the folders: My Documents, My Pictures, My Music, email, contacts and all 
   applications that place key values in the registry will need to be 
   reinstalled. You should abort the setup and explore other options. 

Google Groups link validating the above procedure. Click
http://groups-beta.google.com/group/microsoft.public.windowsxp.
general/msg/32fbc689a3ff95c1?dmode=source

For more detailed instruction on Repair Install click the Repair Install 
XP link below.

Repair Install XP
http://www.michaelstevenstech.com/XPrepairinstall.htm

 Copying of the above not permitted without permission of the 
 Author: Michael Stevens MS-MVP  
 Contact: webmaster@michaelstevenstech.com
 Printable Version 1.0 04/07/05