Hi, I'm Robinson, and I’m happy to help you today.
The error “This site can’t be reached” usually indicates a problem with the DNS settings. The first thing that you can try is to reset the network settings and check if it fixes the problem.
1-Click on Start then click on Settings
2-Click on Network & internet
3-Scroll down and click on "Advanced network settings"
4-Click on the "Network reset", then click on the "Reset now" button
5-Reboot your PC and check if you can access the websites without a problem
Another thing that you can try, is to clear the browser cache.
1-Open the browser then press Ctrl+Shift+Delete
2-Change the time range to "All time"
3-Check all options then click on the Clear button.
4-Relaunch the browser and check if the problem was fixed
Alert: This procedure will delete all cached files including saved passwords and autofill information.
If the problem persists, it could be a driver issue. Please provide some more details to help identify what is causing this problem. Are you using a laptop or a desktop? Which is the full model of your computer/laptop or motherboard?
Also, attach a screenshot of the System Information Page:
1-Right-click on Start then click on Run
2-Type: msinfo32 and click on Ok
And a screenshot of the version of the driver installed:
1-Right-click on Start then click on Device Manager
2-Click to expand the Network adapters
3-Right-click on the Wifi driver and click on properties
4-Take a screenshot of the General and Driver tab
You can see at this link how to include a screenshot in your post.