When you try to run the Office 365 Desktop Setup Tool on a computer that's running Windows XP Service Pack 3 (SP3), you receive the following error message:
You do not have the Windows Update Agent installed on XP.
To resolve this issue, install the Windows Update Agent. For more information about how to do this, click the following article number to view the article in the Microsoft Knowledge Base:
You cannot install updates from Windows Update, Microsoft Update, or by using Automatic Update after a repair install of Windows XP or after you install Windows XP SP3 immediately after a clean install of Windows XP SP2
This issue occurs when you use a Windows XP SP3-based computer that doesn't have the Windows Update Agent installed or if certain files were corrupted. In this scenario, some updates may not be installed by the Office 365 Desktop Setup Tool.
Still need help? Go to the Office 365 Community