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When I open MS Office two dialog boxes appear:

The command cannot be performed because a dialog box is open. Click OK, and then close open dialog boxes to continue.


Microsoft Office Word has not been installed for the current user. Please run setup to install the application.

Can someone tell me why this happened?

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Is this a new install? Has there been recent updates/upgrades done to the PC? Have you tried to uninstall and reinstall Office? – CharlieRB Oct 26 '12 at 11:38
No, it's old installation. I didn't do any changes to my PC. And I haven't tried to reinstall, I was hoping that I don't have to reinstall! :) – Barbara Oct 26 '12 at 11:42
I would just reinstall it considering it would take 20 minutes at most. – Ramhound Oct 26 '12 at 12:03
up vote 1 down vote accepted

This link will help you!!
It happened because apparently you have pirated version of MS Office. This link describes how to fix this problem. Just copy old MSO.DLL file to {Drive}\Files\Pfiles\Common\MSShared\Office11\ and the problem will be solved. Renstalling or repairing MS Office won't help here.

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Your question doesn't have a lot of detail to it, so this is a general answer.

I would suggest repairing the installation from the Control Panel > Add/Remove Programs. Choose to repair rather than remove. If that doesn't work, check the article below.

This can be caused by the user not having proper permissions to complete the installation, a third party program restricting the use or complete installation, or the user not having enough permission to use the types of files associated with the program.

Here is a MS Support article related to this - You receive an error message when you install an Office program or open an Office program or document

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