If you load the original through the disc channel it uses an IOS to run. If you load it from NeoGamma it will use cIOS to load. So if the backup is freezing with the cIOS, then I assume the original loaded with the cIOS would freeze also. But if you load the original disc through the disc channel it should play fine as long as you have the IOS it needs to run.
I would suggest to follow the softmod any wii guide to update your softmod, this would make sure you have all the updated IOS and cIOS needed.