Hi Deena. I'm Greg, an installation specialist and 8 year Windows MVP, here to help you.
Here's the latest tutorial on DNS not responding: https://www.lifewire.com/solving-dns-server-not...
Right click the network icon in System Tray at bottom right end of task bar to Troubleshoot Problems.
Try restarting your modem, router and PC in that order with 1 minute in between each.
Try updating the Network adapter driver from the PC's Support Downloads webpage. http://answers.microsoft.com/en-us/windows/wiki...
Try Rolling back and then Uninstalling the Network adapter driver in Device Manager. Right click Start to open Device Manager, choose the Network adapter you're using, on Driver tab choose Roll back, restart PC. If that doesn't help ry Uninstall, restart to reinstall.
Try all of these steps: https://support.microsoft.com/en-us/help/10741/...
If nothing else works check which version of WIndows 10 you're running at Settings>System>About. If not 1709 what I would do if you haven't yet is manually install Fall Creator Version 1709 by installing Media Creation Tool and choosing to Upgrade Now. http://windows.microsoft.com/en-us/windows-10/m.... This the most stable method to upgrade to the new version (which you need anyway) and will bring you fully up to date with reinstalled Windows that often will solve any other problems you have.
If problems persist with the new version then you can roll it back and hide it with the Hide Updates tool to wait for it to mature more: http://www.thewindowsclub.com/rollback-uninstal...
Hide Updates Tool: https://support.microsoft.com/en-us/kb/3073930
If an older version then you can go over this checklist to make sure the install is set up correctly, optimized for best performance, and any needed repairs get done: http://answers.microsoft.com/en-us/windows/wiki...
I'd also check at Settings>Update & Security>Windows Update under Installed Updates if there were WIndows Updates installed before this problem started. You can uninstall them from the link there to see if the problem goes away. If so you can hide the Updates using the same tool above.
You can also try to System Restore to a point before the problem began: http://home.bt.com/tech-gadgets/computing/how-t...
If still no luck then I'd download the latest media for your version of Windows 10 from this site, click on the ISO or open the bootable media, right click Setup to run it as a Repair Install: https://www.heidoc.net/joomla/technology-scienc...
You also are entitled to Support from your internet provider to get online on all devices. This is always included in the monthly bill. If your router is less than a year old they will also Support getting it connected.
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.