A corrupted file might be the result of a bad wad, installing a system menu may not remove this problem unless it is from that. Trouble is which is the bad wad? Mindlessly uninstalling wads could fully low level brick your Wii.
I wonder if you could use Waninkoko's 4.0 updater to revert to 4.0, hopefully the brick was caused by something untoward in your install of cIOScorp. This would be 'safer' than installing 4.1U system menu wad I believe.