There are thousands of Android phones in the market and to root them, you need ADB drivers (ADB is a short form of Android debug bridge). ADB lets your phone talk to your computer. Unfortunately, there is not one ADB driver for all phones.
Each phone has its own driver and it can tiresome for many to find the right driver. Now, there is a better solution – just install Koush’s universal ADB driver for Windows from here. In Windows 8, you might have to select “more info” and then click on “Run anyway”.
Check out how to root Sony Xperia ZL phone.
Supported operating system is Windows XP, Vista, Windows 7 and 8. Also, you do not have to disable driver verification on Windows 8 OS.