1) Configure wireless network on wireless router without enabling WPA-PSK (open network), then test to connect to it again. If it works, it means you supplied wrong password on PC.
2) Go to Belkin website and download latest driver for that wireless card, uninstall old driver and reinstall the new one, after that test again.
3) If it's PCI wireless card, try to put it into different PCI slots and test again.
4) If still not working, check more wireless network troubleshooting tips here click here , hopefully able to help you.