That's odd, and a little concerning - though I think we'd be seeing more reports if Nintendo changed the Wii Remote to not work with PCs.
Have you tried using both the sync button and 1+2 button discovery methods?
For reference, are the two product IDs on the left side of the remote or label inside the battery compartment either:FCC ID: POO-WC45 IC:4250A-WC45
orFCC ID: UMB-WCF7 IC:6719A-WCF7