Hi,
I own a Toshiba Satellite P 855-34 K with Intel Centrino Wireless N-2230. I exactly confirm the same issues as IrisTran after Windows 8.1 upgrade and installation of the same latest Intel software. Microsoft default drivers work even worst by themselves and anyway it's impossible to uninstall them permanently: they appear again after windows restarting and even after installation of Intel software.
I add that in my notebook the wireless led is always on, even if airplane mode is activated, wireless disabled and Bluetooth disabled. Moreover, it is possible to enable Bluetooth even with airplane mode activated.
Thanks