yes! there is a wii emulator. it's called dolphin. it's a gamecube/wii emulator, but you have to have a pretty powerful computer to run gamecube, let alone wii games. you can give it a shot. i have it, but have never actually used it. http://www.dolphin-emu.com/news.php
It's the best Wii/GC emulator around. It's on a very early stage for wii emulation though, but it can run a few games correctly, just check the compatibility list of games and their forum. Oh, I haven't tested it myself... My computer specification isn't enough.
they're the dolphin, but I can't set the controls on the option, says I need directX or some crap like that!
DirectX is a graphic plugin from Microsoft, it often needed to play lots of newer games. Go download it.
if you ever need to gets gamecube or wii ISOs for your computer, go to [removed]. they have an extensive collection.