You can download and install the updates manually by going to the Microsoft Download Center.
Here are the links to the download and installation instruction pages for PCs running Windows XP.
I included the links for both updates since you didn't specify if you were looking for just one or both.
If you have a different operating system, go to the appropriate page within the Microsoft Download Center.
MS update KB951748: http://www.microsoft.com/downloads/d...DisplayLang=en
MS update KB951978: http://www.microsoft.com/downloads/d...DisplayLang=en
This will bypass the Windows Update function.