Hi,
There is a great site to download updates from.
This link provides updates for vista:
http://www.softwarepatch.com/windows...-security.html
The question I have is - how do you apply this update? It is a .msu file.

Thanks.

Er...have you downloaded it yet? Download it, open it...then it will install. (click on it!)

It is a .msu file.
The computer does not know how to open it.

Did you double click on msu file?

yes

You may need to reinstall Windows Installer: http://support.microsoft.com/kb/893803

thanks