My router is not working on PC - Windows but it was working prefectly on iPhone, iPad, Macbook, Android Tablet PC etc, just not working on PC - Windows

SOLUTION:

Path: Control Panel --- Network and Internet -- Network and Sharing Center - - Change adapter settings - Ethernet property - TCP/IPv4 property ( make sure all DNS Server clean )

Solution B: If those option default is empty without any setting that you can open a command window to use ipconfig /flushdns