Drivers don't just disappear.
Dose the wireless devise show up in Device Manager.
Is it in alarm, if it is there.
If it is there, uninstall it, in Device Manager, then reboot the computer.
Windows should find it, and re install the drivers, that should still be there.
If that doesn't work go to the HP sight, and download them.
Unless a virus or a person deleted the drivers, they are still there.