Use Kaspersky without a key

Kaspersky is one of the world,s best antiviruses,but unfortunately its full version is not availible,there are many keys availible online but believe me these are only to waste your time,Your all efforts will end in smoke.I am posting here a method to use kaspersky antivirus without a key (Temp. sol. if ur key is not Valid)Just follow the steps:you need to back up first in case any thing goes