Login to your router's web interface page (usually set by manufacturers to either 192.168.0.1, or 192.168.1.1, or 192.168.2.1). Once there, go to the wireless settings, and change your passphrase to a new one, so that the new computer be allowed to connect. Other thing you must have in mind is the encryption method the new entrant computer supports. Weaker to stronger methods order is: WEP -> WPA -> WPA2. Older devices might not have all methods available. So, the general rule is to set your encryption method to the strongest method the oldest device to be connected to your network supports.
Don't forget to change all these settings also on the other computers, which already connect to your router by wireless means.
Just my 2 cents...
Carlos
Reset your router to manufacturer's settings by pressing with a small pin the hole found at the rear of the router. It is labeled "reset".
When the router is reset to default setting, connect the router to a computer and visit http://192.168.1.1 (linksys router) or http://192.168.0.1 (d-link router) to configure it. By default, username = admin and password = <blank> or no password. If no password don't work, try the password "admin". So username = admin and password = admin.
You you reach the configuration field, you need to enter the configuration settings provided by your ISP to connect to their internet services. Most likely, you will be using a dynamic IP address (DHCP Enabled) for home users or a static IP for business users. But these information you can get from your Internet Service Provider.
Once you can connect to the internet, configure your wireless network in the router's configuration page to broadcast with encryption. Use WPA or WPA2 or the like in your encryption protocol. Make sure that you configure your laptop for WPA or WPA2 also for them to communicate.
When all is set, try connecting to the internet and try if your wireless router is broadcasting wifi internet.
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