|1. Have you choosen the correct wireless network?|
2. Have you configured the correct encryption type and key at the laptop?
3. Have you checked, whether you got an ip address of your router (ipconfig /all)?
4. Can you connect to the router by wire?
5. Have you checked the routers settings by using it's web interface (when connected to the router by wire)?
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!