Hi Randome1028,
XPS 15 comes in different variants like XPS 15 (L502X), XPS 15 (L501X), XPS 15 (L521x), XPS 15z (L511z).
Please provide the appropriate system model and operating system installed, I would check and help you further in downloading the WLAN card drivers for the system.
You may also download the WLAN card drivers from the driver’s disc that was shipped with the system.
Please reply for further help.