I have SP3 installed an it's working fine. sO SP3 alone is not the reason.

The Wiimote however has problems with some Bluetooth dongles.
There used to be a compatibility list at wiili.org, but unfortunately this site seems to be down.

One thing is for sure: The Wiimote must not be used with a Bluetooth key, this will never work. So if your driver is not possible to use no key at all, chances are high, that dongle and driver are not capable of using a Wiimote properly.

I'm afraid there's not much I can do to help you. But try some other driver like Bluesoleil and see what happens. Bluesoleil is the most reliable driver when trying to connect a Wiimot. Also the standard Windows driver should work.