Plug each end of the crossover cable into a network port on the back of each computer.
On one of the computers that is running this version of Windows, do the following:
Open Network and Sharing Center by clicking the Start button , clicking Control Panel, clicking Network and Internet, and then clicking Network and Sharing Center.
In the network map at the top of Network and Sharing Center, double-click the Unidentified network* icon. (If you have more than one network, this icon will be labeled Multiple networks.)
If network discovery and file sharing are turned off, in Network, click the Information bar containing the following message: "Network discovery and file sharing are turned off. Network computers and devices are not visible. Click to change...," and then click Turn on network discovery and file sharing. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
In the Network discovery and file sharing dialog box, select one of the following options:
No, make the network that I am connected to a private network
Yes, turn on network discovery and file sharing for all public networks
The first option is usually the best choice because it only affects the network that you are connected to.