How to setup wireless network without a router
This guide is for Windows Vista. Guides for WinXP and Windows 7 are given at the end of this post.
Connect your computer to the internet using a Ethernet Connection (Lan Cable)
Open Control Panel, then click on Network and Sharing Center (title)
Now click on the Set up a connection or network
Now on the new window that comes up choose Set up a wireless ad hoc network. Click Next
Click Next again on the following screen.
On this screen enter a name for your network. Then choose a security type. We recommend you set this to WEP or WPA. Also enter a password for this network.
Click on Turn On Internet Connection Sharing. Click Next.
Your wireless network is setup and ready to be used. Other computer can now connect wirelessly to the network you just made.
Setting up wireless network on Windows 7 is much easier and can be done using Virtual Router. Instructions for this software is available on its website.
Windows XP users can read the guide over at Digital Inspiration.