Check out this site, it has some good information that should be able to answer any questions you have about internet connections with Windows 7!
How to Connect to Wireless Networks | Windows 7 Tutorials
Also, make sure your wireless adapter is connected. If it is not enabled, you won't see any wireless networks being available. The next link shows how to do that!
4 steps to set up your home wireless network
I hope this helps!
Windows Outreach Team