Dell 6000 wireless problems

Have Linksys wireless network. My old e-machine worked great-few disconnects. It, of course, had the Linksys Notebook card. My new Dell 6000 gets disconnected a lot-6 to 8 times an hour on Stars and Party. I put the Linksys Notebook card in the Dell and works great but since I have given my wife the e-machine, I can't use it all of the time. Anybody else have disconnect problems with internal wireless card that comes with the Dell 6000? It is the upgraded card-A, B, G. Any suggestions on how to make the internal card work better?