Hello Waerhy,
Welcome to PCHF.
What games are you trying to play? There are some games that are a little flakey running over a LAN.
However, in most cases, it usually a firewall or some kind of security software such as McAfee which is preventing these connections. Try to disable any such software you have installed on these PC's. If this is the cause of your problem, such as the Windows Firewall (My Computer, Control Panel, Windows Firewall), you can click on the Exceptions tab, followed by Add Program, and select the game you want.
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