Cannot reinstall neither uninstall Microsoft Office

My user is not able to start neither Excel neither Word.  When starting Excel, Windows Installer start and require Office 2000 Premium.  Locate it thru our Network and it give me an error about invalid Windows Installer.  Tried to reinstall Office but I got the message from Windows Installer: "Impossible to open this package.  Check if it exist and you are authorized to access it, or check if this package is a valid Windows Installer"  (or something like that, french translation...).  Try to unstall Office but get the same pathern.  My questions are why this and how I can fix it.
Alain_Labelle_IngAsked:
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LONBUSSConnect With a Mentor Commented:
Ok I think this should do the trick...

Windows Installer Appears Every Time I Start an Application
http://www.annoyances.org/exec/show/article08-103

Run the Registry Editor (REGEDIT.EXE).
Expand the branches to HKEY_CURRENT_USER\ Software\ Microsoft\ Office\ 9.0\ Common.
Delete the UserData value on your right, and close the Registry Editor.
The next time you start an Office application, it will ask for your username, but shouldn't bother you again.
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Alain_Labelle_IngAuthor Commented:
It looks more that I have a Windows Installer issue, a Windows Installer corruption...
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LONBUSSCommented:
Ok perhaps you can try this then:

Windows Installer CleanUp Utility
http://support.microsoft.com/default.aspx?kbid=290301

then install the latest Windows Installer (2001) for W2k
http://www.microsoft.com/downloads/details.aspx?FamilyID=4b6140f9-2d36-4977-8fa1-6f8a0f5dca8f&displaylang=en
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LONBUSSCommented:
This will make changes to the registry, so I suggest you make a backup.

How To Backup, Edit, and Restore the Registry in Windows 2000
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q322755
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stlcards2004Commented:
Try removing office thru add remove programs and then remove the office folder from c:\program files\Microsoft Office or what you named it. Then go to start and type in regedit and go to hkey_local_machine\software\office and remove the office key then try to reinstall office.
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Alain_Labelle_IngAuthor Commented:
I already tried removing office thru Add Remove Programs, but got an error message coming from Windows Installer so not able to uninstall it.  The more I think about it, the more it looks as a Windows Installer fuckup
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