WIRLESS NETWORK ON LAPTOP - INTERNET NOT WORKING

The problem i am having is i have a netgear wireless access point connected to a DSL modem/router.
The modems ip is 192.168.0.1
The APs ip is 192.168.0 2

When my laptop is wired to the wireless access point the internet works fine but when i use the wirless network the internet does not work. When using the wireless connection I can access other computers that are wired to the router but i cant access the internet. Whille using the wireless connection i can access the access point and routers set up facilities.

I recently bought a DLINK GW520 PCI wireless card for my desktop. The internet worked fine for about 5 minutes but now I am having the exact same problems as the laptop.

Laptops ip is 192.168.0.5
Desktops ip is 192.168.0.11

Please help me with the laptop and the desktop.