so...what exactly is the problem. you can't point? or you can't press the buttons.
i think you're having the problems many people are having (including me, but i fixed it). here's a quote:
"Our demo Wii remote stopped working this week. The pointer was still functioning but the motion sensing appeared to be totally unworkable.
Today we managed to get through to tech support at Nintendo and they told us to hold the remote face down in one hand and spank it sharply with the other.
"We've only tried this once," they said, "but give it a shot."
I was boggling at the conversation as it was being relayed to me, but by God it worked. Thing is just as precise as it was before."
 woops didn't read the post above
anyway, now i'm sure it's the wiimote.
see, you have to remember. the wii consists of four parts. an accelerometer, a gyrometer, normal buttons, and the ir receiver.
the problem for you, as well as many others seems to be the gyrometer. so th e buttons will work, their receiver will work, the acceleromter will work but without the gyromer, it won't. the problems comes fromt he gyromter getting stuck or something.