You wrote "Windows XP' and just 2 months ago we had the opportunity to test old XP (notice no service packs?) to see what WiFi support there was. It was very basic and only allowed 802.11b/g networks with no password and some WEP protected networks.

To fix this to work with newer networks we connected with ethernet after turning off the WiFi (very important step it turned out) and let it update to SP3 and the other 200 patches. Even then we were not done. A new WiFi driver had to be hunted down from the laptop maker and installed.

Finally we could connect to all the office networks.

You bring up a good question. Do you think Microsoft should correct this area so folk don't have to be network/Windows experts?