Wireless configure laptop
You may be getting a little mixed up; the SSID is the dispayable name of the router over a network and the code you may be refering to is the WEP or passkey for security.
First go into your routers settings and ensure that the DHCP is enabled to automatically give the laptop an IP address.
Check your laptop wireless adapter/reciever is set in the properties to obtain IP adress automatically.
Turn off any encryption you have running on the router and restart both router and laptop.
When laptop boots it should again find all the wireless networks in you locality, then click on your network and click connect.
If all works fine go into router again and then set up security key and note whether it is an 'open' or 'shared' network access as you may need to input this into your laptop if it is unable to reconnect after the restart.
Also if your wifi signal is relatively low, it will not allow a connection to the internet as it is unable to send data at a low signal rate.
If you originally ran the router via an RJ45 network cable, you may need to clear the dns from your laptop, click Start>Run, then type ipconfig /flushdns and restart your laptop to give it a new ip address and dns address.
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