Upon installing SP, if you use a cracked version or a
wrong product key, following message will appear:
"The Product Key used to install Windows is invalid. Please
contact your system administrator or retailer immediately to obtain
a valid Product Key. You may also contact Microsoft Corporation's
Anti-Piracy Team by emailing email@example.com
if you think you have purchased pirated Microsoft software. Please be
assured that any personal information you send to the Microsoft
Corporation's Anti-Piracy Team will be kept in strict confidence."
Change of the product key
Run the register editor (regedit.exe)
from the Start/Run menu or from the command line.
In HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\Current Version\WPAEvents
make any change in OOBETimer
Run %systemroot%\system32\oobe\msoobe.exe /a
from the Start/Run menu or from the command line
Choose Yes, I want to telephone a customer service representative to activate Windows
and confirm by pressing the next button
Click the Change Product key button
Enter the new product key to the gaps and click the Update
A "success" message should appear. By
pressing the OK key return to Windows.
Now you can install the Service Pack.
Detailed description of the change by using script
you will find in the MS: