Is your router set to hide its SSID? If so, then you will have to configure the wireless card to explicitly connect to the network with the SSID of your router? Is MAC address filtering enabled on the router? Is any kind of wireless security enabled on the router?
Thanks for your reply Steve.Sorry but I'm a bit of a novice at this. How would I go about finding out all the info to the questions you asked?
ZyXEL Prestige 660W/HW Series ADSL 2+ 4 Port Gateway with 802.11g Wireless.http://www.stegcomputer.ch/prodspics/zyxel/pics_pdfs/660HW/P660HW_Series_v3-40_QuickStartGuide.pdf