My son has a fairly new HP laptop running Win10. All was well until yesterday when Microsoft asked him if it was a good time for him to update. He said yes, it eventually rebooted and later shut his laptop. Now when he boots up, everything is fine for a few minutes, he can access the internet, etc, but then, his laptop disconnects from the internet and he gets a message that his DNS is not responding. All our other devices hooked up to the same wifi network are working fine. He keeps rebooting with the same results. He has done a virus scan and it found nothing. Any ideas?