I don't know much about Xinfinity or their services and can't really do much to help if the problem is on their side, But there's a few thing's you could troubleshoot to get it working.
You can toogle wi-fi on and off in windows, So maybe it's because it's turned off.
In the Windows 10 desktop click on the wifi icon in the system tray (The bottom pane to the right) It should give you 2 options Wifi and airplane, Just click on wi-fi and turn it on.
If there's no Wi-fi icon in the system tray, Go to the desktop and click on settings in the start menu, Then click on Networks and internet, select wifi in the left pane, Scroll down and click on change adapter options, Right click on wifi and select enable.
Here's a useful link on it How to turn on WiFi in Windows 10 - Tech Advisor
Yep i'm back on win 7 and can post links (
It could also be your router that needs a reset, It's quite easy really
Most routers should have a reset button which restarts the modem, Press it and see if the connection comes back.
Or, You could just switch it off/Or cut off the power to it. Wait 3-5 minutes before turning it on again and see if the connection comes back.