[Oz]

Too easy Twospirits. Get a Wireless Access Point (WAP), I personally like Linksys but there are many that will do the job. Goto the manufacturers website and get the latest firmware for the WAP and update it. Plug it directly into one of your PCs to configure it You might have to turn DHCP off if it includes a DHCP client, use WPA-PSK for authentication. Write down the key somewhere to put into the client PC later. For some extra security, if given the option, do not broadcast a SSID.

For the client PC, if it's a desktop get a PCI card, but stick to a brand name one as the cheapest of the range have really shocking driver support. Again, go for a Linksys card IMO. Put the card in, once the drivers are installed, open the Wireless Configuration. If you chose not to broadcast a SSID, you have to setup an advanced connection and manually enter the network name and key. If you broadcast a SSID, double click on the name of your network, type the key in and see if it appears to be working.

If it is, unplug the WAP from the PC you used to set it up and plug it into your DLink router. On your Wireless Client PC, check if it appears to be working (you might have to perform a restore on the connection).