Internet service providers have their technical issues from time to time, but when something keeps recurring, you might have something wrong on your side. If you can load almost every webpage you want and only some specific ones don't load, try using another computer with the same service provider. If only your computer doesn't load these pages, you might have to reset your DNS client service in Windows. This problem occurs when the DNS client service caches an old IP for a domain name and you try to reach that address when it changed.
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Press "Start + R" on your keyboard to open the "Run" window. Your "Start" key might show as a key with a Windows icon on it next to the "Alt" key. If you have a non-standard keyboard, click your "Start" menu on your computer screen and click "Run." If you don't find a "Run" icon there, go from your "Start" menu to "All Programs," click on "Accessories," and click "Run."
Type "services.msc" in the box provided at the window and click "OK."
Scroll down to "DNS Client," right-click on the service name and click "Properties."
Select "Manual" at "Startup type" and click the "Stop" button. Click "OK" and close all property windows. Try now to access the webpage you previously could not access.