There might be a problem with your wifi adapter?

Please help. This is driving me out of my mind. Out of nowhere my wireless internet stopped working. It wont pick up ANY networks (and there are dozens of networks around me - I live in an apartment). When I run a troubleshoot I receive the following message: "There might be a problem with your wifi adapter." I have a wireless dongle for internet from an older computer so I gave that a try. It recognized "wifi 2" but that wouldn't work either. I get the same error, you "might have a problem with your wifi 2 adapter." Nothing works. I have a series of interviews coming up and I NEED internet access. Can anyone offer any advice. This is driving me insane. I have an XPS 9370 with Killer Wifi. I'm told that the drivers are up to date.