Hello. I've switched to the new operating system and wireless connectivity works just as ***. I've done fresh install of the system, not upgrade. Tried both drivers from Windows Update and the latest provided for Windows 8.1 on DELL support site. None of them are working ok. Right now I'm writing from another PC, because my laptop can't find wireless network. And this is the second time since I've upgraded. It just disconnected and no more networks listed. Before that I was using Windows 7, and it worked well.
Hopefully to see new driver