I wrestled with my wireless setups and finally found a couple of tips that may help others:

 

1) Your computer NAME can never contain any characters other than letters, numbers and dashes, etc. exactly the same rules as apply to naming a file on the desktop under XP. My computer's name had a date with slashes and I could not get it to show up on the network. As soon as I changed to dashes instead of slashes and rebooted the computer showed up immediately.

 

2) My wireless download speeds were always slow whether on my Dell, my Toshiba or whether using a Dell 1370 card or my Intel 3945ABG card. I discovered this forum and downloaded the program "DRTCP" which allows you to adjust your XP O/S settings for fast wireless speeds regardless of the wireless card or wireless router you use. Here's the link:

 

http://www.dslreports.com/forum/remark,15367208

 

My wireless download speeds now equal my wired speeds. Try it. It works.