http://gbatemp.net/threads/i-can-install-ios-in-vwii-but.338809/
You have to rip your own vIOS36 into a WAD in order for the installer to use it to install vcIOS236
BUT
although with 236 you can now install IOS and System Menu on a vWii, the old IOS's from a normal Wii don't work on it, only the vIOS from vWii so this also includes the cIOS meant for a normal Wii, they crash when trying to run in a vWii so a USB-Loader can't use them either.
What we need now is someone to adjust the patches like those in d2x to work with a vIOS base instead of an IOS base. When that happens we will be able to make v-cIOS that can be installed with this new IOS236 ... that will let us do our USB Loading in vWii.
(One step closer but not there yet.)