KB2808735 security update fails

Hi - newbie here so apologies if this belongs in the general Windows Server 2012 forum (or elsewhere).

As per title, the KB2808735 update fails with error: "Code 80073718 Windows Update ran into a problem."

I only installed the OS a few days ago and many other updates have successfully installed - it's just this one that is complaining. I've tried rebooting, etc.

Thanks for any advice,

Adam