Hi, i have a really simple question, but I need an answer ASAP

When I installed Knoppix/Debian to my hdd, i didn't have my mouse installed, and now, it doesn't work in X.

I tried going into KXConfig and setting it up, and it saves the settings and I restart X by pressing CTRL+ALT+BS, but it still doesn't detect it.

How can I set it up?

Thanks

Hernan