A file or hotfix that you downloaded may be corrupted, and it may be the cause of the problem. Or, you may have received a file from Microsoft that was being tested. Such files may be unsigned.
To determine whether a file that you recently downloaded or installed is signed, right-click the file, and then click Properties in Windows Explorer. (For example, right-click MSO.dll, and then click Properties.) You see the Digital Signatures tab for files that are signed correctly. To verify the files that are in a hotfix that you have installed, see the list of files from the Microsoft Knowledge Base article that describes the hotfix.
To resolve this issue, try to download and install the file again. If that does not resolve the issue, or if you received the file directly from Microsoft, contact Microsoft Customer Support Services. To do this, visit the following Microsoft Web site:
The validation process helps you determine whether your copy of Microsoft Office is genuine. Genuine software is software that is published by Microsoft, that is licensed correctly, and that is supported by Microsoft or an authorized partner. Genuine software gives you full capabilities to complete your tasks, access to all the latest updates, and confidence that the software will do what you expect.
For more information about customer service and technical support that is available for Office Genuine Advantage, visit the following Microsoft Web site: