Windows 8.1 is not even detecting arduino when i pluggen in it. No unknown drivers or usb device not recognised shown so that i can install the drivers. Tried everything even install drivers for ftdi chip from their site.
But when i plugged it on Windows 8 PC , it runs directly without any extra installation (It detects the arduino drivers from its IDE). Any solution?
Start by posting a link to where you got the board from.
Also under Windows 8 check what drivers are being installed for the USB chip.