Just follow this guide
Preloader/Priiloader Brick Fix
I need help with my Wii system.
Here is my problem:
I have recently installed the preloader and ran into a problem that my Wii system won't boot.
I have a system menu version 4.2u with homebrew channel installed, gcbackup launcher and neogamma.
I can't get past the boot screen and keeps saying System files have been corrupted.
What do I do?
Ipsa scientia potestas est.
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I figured it out a little bit differently then the guide that you provided me. I will however keep that guide just in case it happens again.