Wow what a bunch of unknowners...lol If you are using a USB wireless dongle, then you already have wireless set up, and no router is needed. Go to Control Panel in the main system and click on Network Connections. Find out the IP settings by clicking Properties, TCP/IP and see what you have for the main computer. Do the same for the laptop, only set the TCP/IP settings to use a default rather than Obtain Automatically. Set the TCP/IP number one higher than your main system. Use the same Subnet Mask and the same Default Gateway. You can run without a router, as long as you are not wanting to share files between them. If you want to share files, you need a hub, or router. By one higher I mean that if the IP Address of the main is something like 192.168.1.1 then you want to change the last number to be 192.168.1.2 for the laptop etc. Hope this helps.