WiFi Switch?

I have a dell wireless WLAN 1350 WLAN Mini PCI Card. The router is a linksys wireless-G.

You should just be able to plug in your router and enable you network card and it should come up within range. If your network card is installed correctly you should have a wifi icon in your system tray that you can click on see if it is connected if not then you will have to click on connect. Is there any security setup on this router. What I mean is has anyone setup any security, or did you take straight out of the box and plug it in.

Inspiron E1505
Intel Core 2 Duo processor T7200 (4MB/2.00GHz/667MHz)
15.4 Inch UltraSharp TrueLife Wide-screen WSXGA+
1GB, DDR2, 533MHz 2 Dimm
256MB ATI MOBILITY RADEON X1400
120GB 5400RPM SATA Hard Drive
8X DVD+/-RW Drive
Intel PRO/Wireless 3945 802.11a/g Mini Card (54Mbps)
Dell Wireless 355 Bluetooth Module (2.0 + EDR)
Windows XP Media Center Edition 2005
Bios A08
pur. Sept. 7 2006
WRT54G Linksys router v2
ZoneAlarm Pro v 6.0.667.000

It has been taken right out of the box and was plugged in.

So did you connect it to the cable modem which provides you internet service? Can you plug in to the router with an ethernet cord using you network adapter(not wireless) and see if you can access the internet.

Inspiron E1505
Intel Core 2 Duo processor T7200 (4MB/2.00GHz/667MHz)
15.4 Inch UltraSharp TrueLife Wide-screen WSXGA+
1GB, DDR2, 533MHz 2 Dimm
256MB ATI MOBILITY RADEON X1400
120GB 5400RPM SATA Hard Drive
8X DVD+/-RW Drive
Intel PRO/Wireless 3945 802.11a/g Mini Card (54Mbps)
Dell Wireless 355 Bluetooth Module (2.0 + EDR)
Windows XP Media Center Edition 2005
Bios A08
pur. Sept. 7 2006
WRT54G Linksys router v2
ZoneAlarm Pro v 6.0.667.000

I can only access the internet with the cable that came with the router. As soon as it is unplugged, I lose internet connection. Nothing else seems to work either.