There is on rare occasion an issue where Windows Vista, ultimately Windows 7 and even Windows Server 2008 will get stuck on patching.  It does not happen often at all, but on the very very rare time that it does, it gives you a heart attack for sure.  Not to worry, it’s something that one can recover from. The symptoms are that the server stays on Configuring updates Stage 3 of 3 0% completed and stays there forever.  Meanwhile you have a heart attack.  First rule, don’t panic. Second rule, take a deep breath and find your install media.  Remember to hit F8 to get into the recovery console.