A: what kind of modem is this? what kind of internet connection do you have (cable/DSL/dial-up)? can you please post the output of "ifconfig" and "lspci"?
B: you need to go to /etc/X11/ and open the XF86Config file there with an editor of your choice (PICO is easy cheesy if you've never used an editor); go down to the section on Input Devices, and you should see something about a mouse there (probably along the lines of "Device" "Mouse1"). When you're in that section, add the following line:
Code:
Option "ZAxisMapping" "4 5"
Reboot your computer and see if it works (use a browser to open a random file and see if you can scroll).
-zsejk