I agree with one person who believes it may be one of the 8.1 subsequent updates that has caused the problem. I have reloaded the manufacturers correct driver, changed power settings to disable the system from closing the device or laptop and NOTHING suggested so far fixes this problem!
Raadghast, yes. What was happening to me was that Wifi is connected but would blank out every few seconds. e.g. works for 25 seconds, then stops, then works again, then stops.
TOTAL EFFING FRUSTRATION.
Changing the router channel seemed to have mitigated the problem somewhat, but it was still there. It took a FULL REINSTALL FROM SCRATCH before the problem went away.
I've never been a fan of turning on Windows Updates automatically and the moment I changed that habit to the "highly recommended" behavior, I paid for it dearly.