Windows 8 + Mac Mini Late 2012 Issues

I have installed windows 8 succesfully on my mac mini but I cannot use windows update. Everytime it installs updates it says "Update failed" and reverts and reboots. I have not problems with Windows 8 on any other computers in the office except this mac mini. I have reinstalled windows 8 a few times though bootcamp, but it fails each time. Can anyone give me some tips?