There should be a log file generated which tells you why it didn't work. Same for the SFC tool. Chances are that its a driver somewhere.
As for whether you'll be able to actually repair it enough for it work, its doubtful. You'll probably spend more time fixing it than what a clean install would do.
You could also try the "non-destructive reinstall" by overwriting the os with itself.
I've never trusted that and it also breaks things because you suddenly end up with an ancient copy of some system library.
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