it's tricky, but there is nothing wrong with your wiimotes.
you could try uninstalling the wiimotes un-pairing in bluetooth, or even uninstalling the bluetooth driver in device manager (you should make sure you have a copy if you do).
i've had luck pairing with default ms drivers
auto_4nxci (Batch XCI to NSP coversion and title renamer)
spent the day writing this up, source code is here, it uses free bsd license
this app automates large scale xci to nsp conversion using 4nxci.
Why?
because XCI sucks, and conversion is a pain.
How?
it uses 4nxci
it batch...