hey,
i have the dell inspiron 2650 and have a wireless network too. one thing: get a windows xp certified wireless card
i've got the dwl-650 and it was headaches, it was not windows xp certified and it screwed up my system.
I got the Microsoft Wireless LAN PCMICA Card for my system and it works flawless and on thing: Its Windows XP Certified Drivers!
There is only a few wireless lan cards that is win xp cert. make sure to check what ever you do. you will save time and money. I got the card for $39 at bestbuy after mail in rebates and i got a great deal! just my suggestion. thanks and happy holidays!