Hey
We have a wireless network in our apartment. One laptop cant connect to the internet.
When I connect it with a cable to the router it works perfectly, but it doesnt work wirelessly. there is no 'ping' to the router neither other addresses.
Start, Connect To, Connection, Properties, Scroll Down TCP/IP and highlight, click Properties and check that Obtain DNS and IP address automatically are enabled.
Presumably you have already considered basic issues such as wireless mode setting in the router and wireless security type and passphrase -- in case not: