try making a backup of your SD, and then formatting it and replacing all files with hose from your backup. except usbloader gx, and the config files too.
Shut down your wii. make sure you use the right usb port, turn it back on, and then reinstall usbloader.
Before trying to load games, set the global 002 fix to "anti".
Check the link in my sig to get all the info u need