I have the Release Preview 8. My computer is an Emachines E525... I know, nooby.. Can someone please help me, I've had the software for a while, this just started happening.
BTW less than a month the Release Preview will expire.
Back to your problem, does your laptop has a wireless switch on it? It might be turned to off (If it was a mechanical switch).
My Laptop have a button to control wifi, that can be controlled by software.