Latitude D600 wireless problems

I have had my Latitude D600 for a year and a half. In that time, I have connected to numerous wireless access points on the road, in airports, hotels, etc. but have never been able to connect to my Linksys router at home. I have two other laptops at home both with lynksys cards which work fine. In addition, anyone else that brings a laptop or Blackberry into the house can access the Lynksys wireless system. It is only my Dell latitude that cannot. Not only does it not connect, if I enable the wireless and try to connect, it shuts down the entire system and forces all of the computers off. I have to reset the system to enable the other computers to access the internet. I have had numerous techs in to try and fix the problem and have spent hours on the phone with both Dell and Lynksys to no avail. Has anyone else had this problem? The only way that I can access the Internet at thispoint is with and ethernet cable.