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check what is the problem in your network it is from hardware or software then you troubleshoot your network problem easily. first1- check your hardware (lan, modem..etc after that you check in network and sharing center.
various methods depending of what type of troubleshooting of network we looking for, basic woud be open control panel >>>> network & sharing center >>> troubleshoot problems
open control panel >>>> network & sharing center >>> troubleshoot problems