If it's the same wii and the same usb/sd then there is no reason it shouldn't work just like it did at your house.
I have modded a wii for a friend and all the emulators worked fine at my house, but at theirs the emulators freeze up and dont work half the time..any ideas?
It would probably be best if either you got your hands on the console and provided the details, or they sign up and give the details. As is, there is no usable information for anyone here to be able make a diagnosis.
EDIT: Maybe I didn't understand you correctly....either way, it would help if you got your hands on the console.
Either disable Auto-Init WiFi in the app you are launching or setup a wifi connection in the System Menu.
The only thing i can think of thats different is the wireless connection..very strange
I don't think the WiFi should make a difference. Only u wouldn't be able to get online. Make sure u have the apps and cios up to date.
[spoiler=Click here for useful links]Softmod any Wii guide Yes ANY Wii!!!
FAT32 Hard Drives - Formatting, Loading, Ripping, Playing (recommended USB setup)
Ultimate List of Troublesome Games & Solutions
The Noob's Guide To Getting Help
How to Run & Post a System Check
Blackscreens & Freezes - Causes & Solutions[/spoiler]