Its a messy install and could be the install itself, but one problem I know that I had before is dead wiikeys... for some reason they were not programmed at the factory and i spent countless hours trying to install them before realizing that of a batch of 20, 15 were dead!

Luckily someone has dumped the wiikey firmware so you program them with an extremely simple to build programmer, and a parallel port.
Your install may be the problem, but if you are sure that it is not, give this a try to program the wiikey, its worked for me on all 15 of my "bad" wiikeys.
Checkout this thread
http://psx-scene.com...ega8-chips.htmlThe very first post has an autoprogrammer so all you need to do is
1. Build SP12 programmer
2. run install_giveio.bat (to install parallel port drivers)
3. run program.bat (to program your chip)
Now for the programmmer...
I have taken pictures from
http://www.openwii.o..._the_Programmerand the "WiiKey 1.9g AutoProgrammer" package that can be downloaded at
http://psx-scene.com...ega8-chips.htmland merged them into an easy to read, self-explanatory schematic for programming the wiikey

*NOTES*
1. The turqoise and brown colored points are not used for programming
2. The blue point has two access points, you can solder to either one, but much easier on the provided pad then the IC leg... actually if u burn off a pad, you can follow the traces and connect the corresponding wire to any of the corresponding IC legs... I had to do this a couple times because I burnt off pads on some of my wiikeys.
Just follow the colorcoding when u build the programmer and connect the wires from the programmer to the specified points on the wiikey and reprogram the wiikey complete with 1.9g firmware.
And YES this diagram can be used to make your very on DIY wiikey. The chip used is an Atmega8L and digikey part number is ATMEGA8L-8PU-ND (if you do make your own wiikey, it is recommended to also add a Capacitor (0.10µF, 50V, ±20%) between VCC and ground points on the Atmega8L... you can see this is done on the wiikey as well, however I am not sure what the other capacitor on the wiikey is for)