http://www.microsoft.com/en-us/download/details.aspx?id=40390
Does installing this before running WindowsUpdate on Internet Explorer 8 work?
If not uninstall XPMode and reinstall it without being connected to Internet.
Choose Do not do automatic updates
Next install this: http://www.microsoft.com/en-us/download/details.aspx?id=40612
Than reconnect to Internet and try updating.