I persume he's refering to that actual WGA update from microsoft, I suggest you email microsoft's support quoting the error code. It might well be your firewall or some other security software so try disabling them first (briefly).
If it is the MS one, don't bother it is MS trying to keep a tight hook on you. Go to custom download and untick it and just get the updates. If it is a crack do it by hand but don't ask here.