To network the two PCs, you need to connect them via their Network Adapters. This can be done either by connecting them both to a network hub/switch/router with ethernet cables or directly, "network adapter" to "network adapter", with a *CROSSOVER* ethernet cable.
Using a Router will let you have simultaneous internet access in both PCs, otherwise you need to have one PC connected to the internet and then enable "Internet Connection Sharing" on its connection. The second PC will then have internet access provided the first one is running and online.
The fact that you're using Windows 7 shouldn't make any difference. I have both "wired" and "wireless" network adapters running in Win7.