1)You will need fastboot drivers,if you are running windows 7,then it will install automatically. (No need of working ADB) though the kit includes working adb drivers.
2)Download this Rooting kit:
3)Extract the contents to a folder.
Instructions for using the kit:
Advice:this will overwrite your recovery,so follow second post to get stock recovery back.
1).Boot your phone in fastboot mode by holding vol up + power on boot till you see a green screen.
2).connect your phone to pc via USB cable and wait for fastboot drivers to install.
3).Double click and run ROOT.bat
4).When the recovery is flashed,pull out the battery.
5).Now reboot the phone into recovery mode by holding VOl up + power button (first you will see green screen then after some time red screen.
6).When you see the red screen,then press home (first soft touch button on A9).You will see a faded black screen.
7).Congratulations! Your phone is rooted.wait You can reboot,if you just wanted the rooting,otherwise:
8).Connect the phone to computer and install the provided drivers for new devices in device manager.
9).This will enable you to use Rooted SU ADB shell while in recovery.
10).Reboot and your device is rooted.