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Here are a couple of options for you to look at:

The Linksys Wireless-G PCI Card WMP54G installs in most desktops and lets you put your computer almost anywhere in the building, without the cost and hassle of running network cables. Now you don't have to drill holes in your walls and climb through the attic or cellar to get connected to the network. Once you're connected, you can keep in touch with your e-mail, access the Internet, use instant messaging to chat with friends, and share files and other resources such as printers and network storage with other computers on the network.

http://www.google.com/products/catalog?hl=en&q=wireless+card+desktop&um=1&ie=UTF-8&cid=1741965145001 5414738&sa=X&oi=product_catalog_result&resnum=1&ct=result#ps-sellers

This Wireless 802.11g USB adapter is designed for desktop computers:

http://www.pcconnection.com/IPA/Shop/Product/Detail.htm?sku=5541949&oext=1038A&ci_src=14110944&ci_sk u=5541949

Linksys WRT54G Wireless Router Product Information

The Linksys Wireless-G Broadband Router is really three devices in one box. First, there's the Wireless Access Point, which lets you connect both screaming fast Wireless-G (802.11g at 54Mbps) and Wireless-B (802.11b at 11Mbps) devices to the network. There's also a built-in 4- port full-duplex 10/100 Switch to connect your wired-Ethernet devices together. Connect four PCs directly, or attach more hubs and switches to create as big a network as you need. Finally, the Router function ties it all together and lets your whole network share a highspeed cable or DSL Internet connection. Once your computers are connected to the Router and the Internet, they can communicate with each other too, sharing resources and files. All your computers can print on a shared printer connected anywhere in the house. And your computers can share all kinds of files -- music, digital pictures, and documents.

Key Features
Router Functionalities DHCP Server, Firewall, VPN Pass-Thru, Wireless Access Point
Connectivity Wireless

Interfaces
Built-In 4-port Built-In Switch
LAN Interfaces 10/100 Base-T
WAN Interfaces 1 x 10/100 Base-T

Standards and Protocols
LAN Standards IEEE 802.3 CSMA/CD or Ethernet, IEEE 802.3u 100 Mbps (Fast Ethernet)
Protocols DHCP

Firewall / VPN
Firewall Features Stateful Packet Inspection (SPI)

Wireless
WLAN Standards IEEE 802.11g/b
802.11b Data Rates 11 Mbps, 5.5 Mbps, 2 Mbps, 1 Mbps
802.11g Data Rates 54 Mbps, 48 Mbps, 36 Mbps, 24 Mbps, 28 Mbps, 12 Mbps, 9 Mbps, 6 Mbps, 5.5 Mbps, 2 Mbps, 1 Mbps
Modulation 16QAM, 64QAM, BPSK, CCK, DBPSK, DQPSK, DSSS, OFDM, QPSK
Security WEP, WPA, Wireless MAC Address Filtering
Antenna Type Detachable Antenna x 2

You might want to consider putting the router where the Gateway is if you can also get your modem hookup there for your high speed Internet connection. That would save you buying a Wireless PCI card or Wireless USB Adapter for that computer. If you can’t do that, then choose the other desktop and connect that computer to one of the router Ethernet ports with an Ethernet (Cat 5 cable) connection. Set the router up from that computer for all your computers. Instructions or a disk should come with the router. If you have a problem, call Linksys – they will guide you through the setup over the phone.

For the Wireless settings, use WPA Network Authentication at the minimum, WPA-PSK if available. Use TKIP Data Encryption. Use a Passphrase (password) for WPA-PSK. Assign an SSID but do not broadcast it (there should be an option to broadcast or not broadcast the SSID) . Note that by default, any wireless PC that is configured with the correct SSID will be allowed access to your wireless network. For increased security, you can restrict access to the wireless network to only allow specific PCs based on their MAC addresses. If the Wireless portion of the router has settings for Access Control, set it up so that it will only recognize and allow access to the computers that you include for your wireless computers. You must furnish the Names and Media Access Control (MAC) addresses of those computers.

You can find the MAC addresses of your wireless cards on your computers by going to the Control Panel > Network Connections. Right-click on the Wireless Network Icon and select Properties from the popup menu that appears. At the top of the Properties Window near the top you will see Connect Using: and a text window. To the right of that, select the Configure button. On that window that appears, make sure that the Advanced tab is selected. The MAC address should be in the text bar at the bottom of the window.

The name of your computer is found by going to the Control Panel > System. On the window that appears, select the Computer Name tab. All computers on your network will need to have a different computer name, but the same Workgroup name. Use the Change button on the window to specify the name and workgroup on each of your computers. With this configuration, you can set up your home network so your computers can talk to one another and share the same printer through the Printer and Folder/File sharing options that you select for each computer.
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Repa

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