change the product key win 2003 r2 ent

How can I change the product key for the MS server 2003 R2 ent. I put a difference product key other than what we purchased. This is a open license.
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Tomas ValentaConnect With a Mentor IT ManagerCommented:
1.)  Log in as the local Administrator
2.)  Click Start > Run > and type in Regedit
3.)  Browse to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows
4.)  In the right pane, right-click OOBETimer, and then click Modify
Change at least one digit of this value to deactivate Windows
5.)  Click OK and close regedit
6.)  Click Start > Run and type in:
"%systemroot%\system32\oobe\msoobe.exe /a"
7.)  Click Yes, I want to telephone a customer service representative to
activate Windows, and then click Next
8.)  Click Change Product Key (at the bottom)
9.)  Enter your valid Product Key
10.)  Press Update and close the window.
11.)  If you are returned to the previous window, click Remind me later
12.)  Restart your computer
13.)  After  the restart, click Start > Run,  Type in:
"%systemroot%\system32\oobe\msoobe.exe /a" without the quotes.
Make sure the dialog box says 'your copy of windows is already activated'
Mike ThomasConsultantCommented:
Mike ThomasConsultantCommented:
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