Today, I 
broke my wireless network setup under Windows XP: Going to Available Wireless networks the following message appeared (see image):
Windows cannot configure this wireless connection […] If you want Windows to configure this wireless conection, start the Wireless Zero Configuration service.
No need to panic: first confirm the service is not running. Open up your Wireless network connection properties and see if the ‘Wireless Networks’ tab is there. If not, verify if your wireless device is active [go to Control Panel, System, Advanced, Device Manager, Network Adapters].
No conflicts? Open up the Services applet
, scroll down and find the ‘Wireless Zero Configuration Service’. Most likely it is ‘off’ (I’ll leave it up to you to figure out why it was turned off or why it crashed), so turn it on. Leave it on Automatic too.
Now, go back to your Wireless Network Connection Properties (link goes to image) and make sure that you check the ‘Use Windows to configure my wireless networks’.
Et Voila!