Go to the control panel, set show to big icons, find "Devices and Printers" and right click on the green text, select "Open in a new tab", add devices. On you wiimote click 1 and 2 at the same time, wait it to pop-up, left click it. It should ask for a PIN, click Next even if you didn't inserted...
Are you near sea/salt water, or in general they just don't last. Sounds like if you driving a mercedes, you need a garage. I get snow n ice here so nothing worse than clearing that shit off at 6am rushing to get to work.