It sounds like your PC may not have a WiFi adapter device installed if it's not listed in your Network and Internet area in Ctrl Pnl. Your laptop WiFi is working because it has a WiFi adapter device installed. Since it sounds like your laptop *is* receiving WiFi signals from your Xfinity modem-router combo, you have the sending WiFi part covered at the modem/router end of things. A WiFi set up must have WiFi on both (one of either modem/router/modem-router combo/access point) with WiFi capability enabled.and also on a destination device (ie laptop/PC/tablet/phone) with WiFi adapter capability enabled (internal WiFi card/USB WiFi dongle).
