I got the same problem on my PC, its happened 3 times now, and I think I've narrowed it down on my PC. after the updates, the DHCP service will not start, and when I try to start it up, it tells me that it cant find it. havent figured out exactly which update it was, but after the first time it happened, I hid all the available updates, and it happened again when I went to get my next set of updates. Now I'm too scared to get any updates!