Hi!
First of all You can check the appropriate key in Windows Registry
by using registry FFC.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\12.0] for Office 2007
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\11.0] for Office 2003
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\10.0] for Office 2000

WBR
Juri