I never once conntected the wii to the internet and now suddenly when I do the usb loader stops working. when I click on the channel the screen just goes black. luckly all I had was a backup of my paper mario game. what did i do to my usb loader. is it ruined?
Got a Wii Update... -- That's where you went wrong as most Wii Updates include anti-modding measures, including stubbed IOS's that destroy the cIOS's that some advanced mods, like USB Loader GX, require. If you still have access to the Homebrew Channel (if you're running 1.0.7 or 1.0.8, you should be OK), you can try repair the damage. You'll have to install cIOS 236 first to regain trucha-bug support that's required to install cIOS 249 (as well as deleting the stubbed IOS 249 from the update). You may not be able to utilize any channel loaders since most modders haven't attempted to modify Wii Menu 4.3's system IOS (IOS 80), but it should be functional through the Homebrew Channel.
The system update that was downloaded corrupted the USB Loader as Nintendo is against modding your Wii.
A USB Loader is an unsupported hack. When you connected to the internet for the first time, you probably downloaded a system update that disabled the USB Loader.