Navigate the the location below in your registry and make the corresponding change.

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\

{00000409-78E1-11D2-B60F-006097C998E7}] 

Change "RegCompany" to whatever you would like it to be.

Then goto:

[HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Common\UserInfo] 

And rename the "UserInfo" part to "OldUserInfo"

For More Info Visit: http://support.microsoft.com/support/kb/articles/Q233/4/99.ASP

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