Internet -> Modem -> Router -> PC
Example: Internet Address of 71.43.56.12
Modem (internal) 192.168.0.1
Router Address of 192.168.1.1
PC 192.168.1.2
So ..
You need open the ports on the Modem and forward to the Router
You take the router ports and forward to your PC
You make sure the firewall is open on the PC.
I hear all the talk about the router, but the modem also has a router component.
Speedtouch DSL
Note. I am guess on the IP's I listed as a sample. You'll need to check all of them.
And I *very* confident you should be able to get in.