Lots of people (including me) had this issue and it was temporary, means it should get fixed after a few days ~ week. I've never found out what's the cause for that, so if anyone else knows, I'm pretty sure they'll reply here.
But anyways, I'd recommend you to try the following;
- Restart your PC & router at once.
- If you got an internet cable plugged in your PC, then unplug it for a few moments and then plug it back.
