Windows 7 Can't install update KB947821


My system has corrupt files according to the "sfc /scannow" command and after running it 3 times I am suppose to use the windows readiness tool, and install additional updates, the first time this update came up it installed and i reset the system, running the .exe again the same update appears only there is no install loading bar. And it keeps on appearing.

Anyone know whats up?
This update is notorious for getting "stuck", start it and let it run overnight it may finish.
But it finished once as if it were like any other upate? I can't run it over night I have keep clicking the .exe they have you download.