I have surprisingly little to go on here.
I would ask for your logs in this situation normally but that's the whole problem in the first place.
in the management console under services, the service is clearly named
windows event log
It should be started and set to automatic.
Based on what little I have to go on this is a guessing game. In the event that your com+ is completely destroyed a
http://www.sevenforums.com/tutorials/3413-repair-install.html may actually be your best option.
there is literally a million things 'hardrive trouble' can lead to, and I'm good... but unfortunately my crystal ball is broken.