I have no idea except for the following. Maybe someone else will know
As far as I know, there isn't a registry entry that does what you
need. Below are instructions originally posted by
Leon Hao from Microsoft to manually remove and then reinstall Office
2007. Follow them EXACTLY... no ad-libbing ... except make sure the Opa12.dat file is deleted before you perform step 11.
1. Quit all running programs.
2. Download and install the Windows Installer Cleanup Utility.
http://download.microsoft.com/download/E/9/D/E9D80355-7AB4-45B8-80E8-983A48D5E1BD/msicuu2.exe
3. After you have installed the Windows Installer CleanUp Utility, click
Start>All Programs>Windows Install Clean Up.
4. Highlight Microsoft Office 2007 entry in the list and then click
Remove. Click OK and wait for the process to end. If any other stand alone
Office applications (such as Visio and Project) appear on the list, please
also remove them. Then, click Exit to close the Windows Installer Cleanup
utility.
5. Click Start>Run, type "regedit" (without the quotation marks) in the
Open box and press Enter.
6. Locate the registry keys below and click Delete from the Edit menu.
Click OK on the following warning dialog box.
Note: Please go to File>Export and backup all the registry first.
HKEY_CURRENT_USER\Software\Microsoft\Office
HKEY_LOCAL_MACHINE\Software\Microsoft\Office
Quit Registry Editor.
7. Delete or rename the following folders or files if they exist:
C:\Program Files\Microsoft Office
C:\Program Files\Common Files\Microsoft Shared\OFFICE12
C:\Documents and Settings\<UserName>\Application Data\Microsoft\Excel
C:\Documents and Settings\<UserName>\Application
Data\Microsoft\Office
C:\Documents and Settings\<UserName>\Application
Data\Microsoft\Outlook
C:\Documents and Settings\<UserName>\Application
Data\Microsoft\Publisher
C:\Documents and Settings\<UserName>\Application
Data\Microsoft\Templates\Normal.dot
C:\Documents and Settings\<UserName>\Application Data\Microsoft\Word
C:\Documents and Settings\All Users\Application Data\Microsoft\Office
C:\Program Files\OfficeUpdate12
8. Click Start>Run, type "%Temp%" (without the quotation marks) in the
Open box and press Enter. Delete all the files and folders within it. If
there are some files which cannot be deleted, just leave them alone and
this will not affect the result.
9. Empty the Recycle Bin.
10. To remove MAPI, search for and rename the following folders/files if
they exist:
C:\Windows\system32\mapi32.dll
C:\Windows\system32\mapisvc.inf
C:\Program Files\Common Files\System\Msmapi
C:\Program Files\Common Files\System\Mapi
11. Restart your computer and install Office 2007 again.
