March 13 2013 windows update question

Vista home premium
SP2
NIS 2012

Installed the windows updates last night and as prompted, restarted my PC
Normally it will shutdown within a minute or so.
However the shutdown hung for at least 45 minutes until I did a hard shutdown (held the power button down until PC shut off).
I restarted and it did its thing were it said stage 3 of updates completing. And it finished within minutes.
Wondering if anyone else experienced this shut down hang?
I ran a quick scan after it booted up just to be safe, only tracking cookies found