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To solve this problem, you need to completely remove Microsoft Office from your computer, and then install it again.
You can always try to uninstall it through Windows’ Programs and Features tool in Control Panel.
These issues are well understood and the use of SHA-1 certificates for specific purposes that require resistance against these attacks has been discouraged.
At Microsoft, the Security Development Lifecycle has required Microsoft to no longer use the SHA-1 hashing algorithm as a default functionality in Microsoft software.
For administrators and enterprise installations, or end users who want to install this security update manually (including customers who have not enabled automatic updating), Microsoft recommends that customers apply the update at the earliest opportunity using update management software, or by checking for updates using the Microsoft Update service.This update is not available for Windows Server 2003, Windows Vista, or Windows Server 2008. Customers who have automatic updating enabled and configured to check online for updates from Microsoft Update typically will not need to take any action because this security update will be downloaded and installed automatically.Customers who have not enabled automatic updating need to check for updates and install this update manually.The purpose of this advisory is to inform customers of an update that adds functionality for the SHA-2 hashing algorithm to all supported editions of Windows 7 and Windows Server 2008 R2.Is this a security vulnerability that requires Microsoft to issue a security update? A signing mechanism alternative to SHA-1 has been available for some time, and the use of SHA-1 as a hashing algorithm for signing purposes has been discouraged and is no longer a best practice.
The root cause of the problem is a known weakness of the SHA-1 hashing algorithm that exposes it to collision attacks.