Many homes and offices have more than one Windows-based computer, and sometimes you need to share a data file from one computer to the other. The fastest way is by using an Ethernet crossover cable. It takes only a few minutes to set up and then you can share files instantly to and from your laptop to your PC tower.
Plug an Ethernet crossover cable into the laptop and the tower. Insert the crossover cable into the network port on the back of the PC tower and on the side of the laptop. Turn both computers on.
Click "Start" on the task bar of one of the computers.
Click on the "Control Panel," followed by clicking on "Network and Internet."
Click on the "Network and Sharing Center" icon to open the application.
Double-click to open the "Unidentified Network" icon. It may also be labelled "Multiple Networks."
Click on "Network" and then click to "Turn on network discovery and file sharing" from the information bar.
Decide whether you would like to be on a "Private Network" or a "Public Network" and click the appropriate setting. A private network is only available to users connected on your network; a public network will share information with surrounding networks. Once you have selected a public or private network, both computers should show up in the Network window.