Hello, There is problems related to WiFi with macbook air 2013 and windows 7 x64 via bootcamp.
Problem appears when firstly booting mountain lion then if i choose restart>keep alt option>choose windows> WiFi adapter dead.
If i shutdown MBA, choose firstly windows, no issues with WiFi.
Also at bootcamp support site http://support.apple.com/kb/DL1638 at system requirements macbook air 2013 isn't listed. So maybe new macbook air isn't fully supported by bootcamp drivers? any thoughts?
Make sure Mac OS X has been updated to 10.8.5. Then make sure you have the Macbook Air SMC Update v1.9. Both should let you run the EFI update.