I have a problem which is easily found on google, Its the "Dslutility.exe; Modem not detected!" problem

I'll keep it basic, I poped in the installation CD, gone through the plugging section but next I get this pop up saying:

dslutility.exe

Modem not detected! Please check the following:
1. The power adapter is connected to your modem and an electrical outlet.
2. Your modems Ethernet cable is properly connected to your computer.
3. Network card is properly installed in your computer.

This is very erritating me, I just purchased this modem/router (DSL-G604T) from Trademe, my late modem (DSL-502T) was also purchased from Trademe and its wokring perfectly.

I'm sure that its not the CAT5's (blue cable) problem.

Only thing thats making guess is the modem (DSL-G604T) may be faulty

I can find people with the exact same problems, the only solution givin was to manually setup the modem (DSL-G604T) through; http://10.1.1.1 which I'm going to try after this.

If anyone has this problem and has fixed it please tell me how you did it, I would also appreciate any other suggestions.

P.S I don't know what a network card is or what its used for.