Hi
When I look up ZyXEL Prestige 2602HW modem on google I get almost all descriptions as a wireless router. Are you sure it's not a router? If it's not, have you connected the dsl data cable to the modem? Connected the ethernet cable to the modem and to a working port on the back of your pc? Is your phone line setup for DSL? Is the phone line hooked up to the dsl data cable? Do you have a dsl filter on all phones, cable boxes, etc. in the house? If it's a wireless router/modem you may need to login to your router to configure the settings. To do that you would:
Press start, run, and type in cmd
In dos type in "ipconfig"
Write down your ip address when it comes up
Go into internet explorer and type in that ip address in the address bar and press enter
It should come up with a Username and Password dialogue box
Type in admin for the username and leave the password blank and press enter
Run the wizard to set up the wireless modem/router
You may need to call ZyXEL Prestige 2602HW modem manufacturers and ask them what ip address you will need to use for the modem/router. You can put that in while you are running the wizard to configure the router.