Welcome to the forum.
Unfortunately I have got bad news. Looking at the log tells me there are a lot of system files missing. You should know better where they are gone.
In those situations the best option is to reformat and reinstall.
As a long shot you can use System Restore and hope it is not corrupted. But looking at those missing entries, I doubt it works.
To use the system restore, after entering System Recovery Options
select System Restore
and try the restore point made on 2012-09-15.
If that failed the best way is to reformat and reinstall.
Edited by Farbar, 24 September 2012 - 09:22 AM.