Network Windows 7 and Mac
I am assuming that you just want to copy paste files/folders from your main (Windows) machine to the Mac or vice versa.

You can do this other way around (using Mac) pretty easily. In your Mac go to the Finder and in the Go menu in the menu bar you see "Connect to Server…". Use this option and enter the IP address of your Windows machine. Then login with your Windows ID and password.

Now unless you unmount this connection you will see your Windows machine as an external drive in your left side of your Finder windows and you will always be connected. If you want to close the connection, you can simply click on the eject button on the Windows drive which should be on your left pane in the Finder window (which shows Macintosh hard drive, Applications etc.). Note that this requires your Windows machine to have file sharing on. 

You could also install an ssh/scp program on Windows (such as that included in Cygwin) and use that to transfer files (turn on Remote Login in the Mac's Sharing preference pane).