While i was "googleing" my speed from 150 mbps downed to 11mbps, i found out a new driver for the n 7260.
I tried to install the new 17.0.5 driver but, it only gives me an BSOD (page fault in nonpaged area) while installing the driver
then i was never able to get into the normal mode again, (safe mode--OK), and now I am back to 16.5.3.6 .
My system:
Wireless-N 7260
Windows 8.1 with Update 1
Fujitsu AH544