Close all Microsoft Office applications.
Click Start, click Run, type regedit in the Open box, and then click OK.
Locate the following registry subkey:
HKEY_LOCAL_MACHINE\Software\Microsoft\Office\12.0\Registration
If you find additional subkeys that reference Microsoft 12.0 registration, open each subkey, and then identify the product by the ProductName entry.
For example: ProductName=Microsoft Office Professional Plus 2007
When you find the subkey for the product from which you want to remove the existing product license key, delete the following entries:
DigitalProductID
ProductID
Use on of the following Product Codes :
KGFVY-7733B-8WCK9-KTG64-BC7D8
DBXYD-TF477-46YM4-W74MH-6YDQ8
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Since it's a hebrew forum I can't align the lines correctly, so if you don't understand something, PM me.