You need to uninstall cioscorp, then you should be able to install the hackmii installer.
Download
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Download
[Only Registered Users Can See Links. Click Here To Register]
Backup your sd-card and format fat32.
Extract bannerbomb to sd-card
Extract cioscorp uninstall to sd-card, rename its dol file to
boot.dol
Do not put the sd-card in the wii
Power on the wii
Push the sd-card icon (on the main wii screen, not from settings)
Insert sd-card
load boot.dol
Uninstall cioscorp- read and follow the directions
After that proceed to the 4.2 guide
[Only Registered Users Can See Links. Click Here To Register]
Best of luck