Unable to verify your Product Key when visiting the Windows Update site after installing SP2?
Well let's fix that now.

Follow these step by step instructions:

1. Two programs have been supplied within this RAR file.
---> a. WinXP keyChanger.exe
---> b. WinXP Valid KeyGen.exe

2. The WinXP keyChanger.exe program will find and display your current WindowsXP key.  It is also what you will use to CHANGE your WinXP key to a valid one.

3. Load up the WinXP Valid KeyGen.exe program

4. For Windows XP Corporate Edition, choose the "Windows XP Pro. VLK" option from the Product Family drop down combo box.

5. Click the "Generate" button - a seed is also created (you won't need to worry about this, it's just showing us that this program is doing things properly).

6. Load up the WinXp keyChanger.exe program

7. Click the "Options" Menu

8. Select the "Change Windows Key" option

9. Copy the Generated XP Key from the WinXP Valid KeyGen.exe program over to the spaces provided within the WinXP keyChanger.exe program.

10. Click the "Change" button in the WinXP keyChanger.exe program.

11. After it finishes doing what it does, close both programs.

12. Load up the WinXP keyChanger.exe program again to verify that it now finds your newly entered XP Key.

13. Close it again.

14. RESTART your computer.  This you must do.

15. Log on to the windows update v5 (http://windowsupdate.microsoft.com/) site and enjoy downloading once again.

Too Easy Microsoft.  
Next please. 

-Md 

PS: If you didn't have one before, you now do.  A uniquely generated VALID XP Key that no one else in the world has (well chances are extremely rare that you will).  What does this do?  It makes it even more difficult for Microsoft to locate you.  We must take our hats off to Microsofts genius. *shakes head* Dickheads.