Sorry, the WiiHacks crystal ball is offline at the moment, so our mind reading capabilities are somewhat diminished. Are you following a guide to do what you are doing or are you just winging it? And there is no such thing as an app called "Wad installer", so no idea what wad app you are using. Same goes for "Usb loader". There are quite a few different ones so that doesn't tell us much.
The only advice I can give you without knowing anything at all really about your situation is the same advice that everyone else gets. Go follow the Softmod ANY Wii Guide, link is below in my sig. After that if you have any more issues, make sure you are a LOT more descriptive in explaining them.