Macbook pro, boot camp, can't enable wifi adapter
Try to install the Windows 8.1 driver from this website: Link (or here you have the Download Link directly: download).

One solution would be: 


  
  Boot into OS X
  Select Windows as primary boot partition
  Restart your Mac (it should boot now directly into Windows)
  Restart Windows (NOT turning off. Start > Restart)
  


Second suggestion:


  
  Uninstall the driver completely 
  Restart into OS X
  Then restart into Windows
  


Sometimes the WiFi driver is working after a few minutes. If not: Install the driver from above (from the Download link).

It has something to do with Bootcamp and Mac. This isn't a Windows problem. The driver isn't loading properly. Maybe Apple is going to fix this.