Wiiload is a method of loading .dol and .elf files over the network. If the icon in the very bottom right of the Homebrew Channel is lit up, it should work for you.
First, download the .elf package, which includes all version of Wiiload, from the official homebrew channel site. Then determine your Wii's IP address by pressing the home button on the Wiimote at the Homebrew Channel's main screen. After that, follow the instructions for your operating system.
- Set the environment variable by going to Control Panel - System - Advanced - Environment Variables, then click "new" under either category. The variable name is WIILOAD and the value is tcp:yourIP, where yourIP is the Wii's IP. Click "OK" here and in System Properties.
- Turn the Wii on and go the the homebrew channel.
- Go to wherever you put the pack you downloaded and extracted in step one, open the Wiiload folder, and open the win32 folder. You should see a single executable, wiiload.exe. Drop a .elf on this and it should load on the Wii.
- You can create a shortcut and drop files on that, if you prefer.