Wireless connection doesn't work

Question

Please bear with me, this is the first time I have tried to use a wireless router, and the first time I've used Cable internet.
Info:
WRT54G
Dell 1395 WLAN g wireless card (came with Inspiron laptop)
XP
Comcast came to insall internet this afternoon.  Everything works fine when internet cable is plugged into the PC, but once unplugged it cannot find a signal even though I have created a network.
Please advise.

Answer 1

Consider / Try:
Make sure channel is set to 1, 6, or 11 -- there is a reason for this: no overlapping signals
Make sure the printer and the router are at least three feet (about a meter) apart.
Try moving the printer or router -- even six or so inches may do it.
Routers function better higher from the ground - if you have a cabinet, place the router on top of it instead of inside.
Routers are NOT, repeat NOT equal.  Even well known, newer routers -- in the "less expensive" category -- might be plagued with lack of features, slow speed, and poor (weak) antennas.  Weak routers offer less performance:  To give this type of router a chance to succeed, remove any objects that may reduce or block the signal:  remove or move metal cabinets or appliances, large furniture, electronics (2.4 GHz).   Do not expect a smaller, weaker, older router to send a strong signal through heavy walls, downstairs, or down the hallway from where the printer is located.
Check this interesting and useful post by our own HP Forum Expert Cloud_Strider:
My printer will not stay connected to the network
The settings may or may not apply directly to your case; the information illustrates wireless router connection points.
Help / Guidance:
Reconfiguring your printer
Troubleshooting Your Printer - Network
ePrint Help and Tips Page
Click the Kudos Star! 
It is a great “Thank You” for the Author's efforts.
Kind Regards,
Dragon-Fur