Google and youtube just simply don't go down. I think gmail went down for like, an hour last year. Those services have millions invested in making sure they stay up.
I would try another browser, and then I'd look at your hosts file. Or try another device - if your other device doesn't work, then its your router, and that's weird.
The problem is going to be very simple. If you're really worried about a virus, run a virus scan. Windows Defender is boss and comes already installed.