You can't access the router login page. This can happen
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> If you (mistakenly) or someone else change the default loging ip (192.168.1.1). In this case, you can find it if your pc is connected with router. Press windows+R >typed cmd in the run box > Enter > type ipconfig/all > enter. It will show you bunch off stuffs. Search for > Default Gateway. This Ip is your router's login ip.
or, Right click network Icon > Open Network And sharing center. If you are connected to router, click on your network name. (Right side of your Active networks. The blue colored text) > Then press 'details'. Here you will find Default gateway Address. It is your router login ip.
>May be someone else logged in and Specified a PC to access the Router's Web-Based Utility. By default, it is set to All local pc. But if it is set to Only the PCs listed can browse the built-in web pages to perform Administrator tasks, then only specific PC can access it. If it happens, then your pc isn't on that list. In this case, only way is, you have to reset the router to access again from your pc.
You don't have Internet
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> Login to router. Check the router WAN info or Internet Connection Info if it is working or not.
> Check The modem.
> And last, if still no Internet, you have to call ISP for this. from whom you have taken your internet connection.