Attempting to upgrade Internet Explorer from within Windows Update seems to fail more often than it works. These links are for so-called 'Offline Installers" that can be downloaded to a portable drive and installed anywhere. I prefer to use these versus the update method.


Most all our PCs should be running a 64-bit version of Windows. 


http://download.microsoft.com/download/7/1/7/7179A150-F2D2-4502-9D70-4B59EA148EAA/IE11-Windows6.1-x64-en-us.exe


If your PC OS is 32 bit:


http://download.microsoft.com/download/9/2/F/92FC119C-3BCD-476C-B425-038A39625558/IE11-Windows6.1-x86-en-us.exe