Well, to start off you need to make sure you have a wireless network setup. (If you don't, you need to purchase a wireless router and plug your ethernet cable into it and afterwards go through the setup options [name, optional password, etc]). Next you need to connect to the network from Windows 7. To do this, make sure you wifi card is on (usually indicated by a glowing antenna icon) and then click the bars icon next to the clock in the taskbar. From the point, click on your network and then hit connect. If needed, enter a password.