Primary Domain Controller Broken after Windows Updates

Hi Guys,

Little Stressed at the moment, Left work last night with my Primary DC finishing Windows Updates, and told it to reboot when done - Simple Right....

Well to my horror I came in this morning logon onto my Laptop, and couldn't get onto my DC
Loaded the XenServer Manager and say that it was stuck on Installing update 17-20 I think,
So I asked it nicely to reboot... nothing, So then Force Rebooted it and then it started patching all thew updates all 1900 of them.

Anyway its now Lunch time! and I have a broken PDC, Which wont Start the DHCP Service...
and Doesn't want to play ball! I have like two days to reimage pcs and sort IPads,

Had to create a new scope on my Secondary DC - So I could start imaging..
Havent got a clue why its happened or how, But just don't have enough time to sort it..

Am tempted to move the Schema roles over and...