1. At first, Delete any old key (if there is a key in kaspersky)
2. Now, Disable Self Defense (Go to Settings, In Option, Turn off Self Defense and Click Ok )
3. Now, Goto Start menu, Click Run and Type "regedit". Go to :
HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab\protected\AVP9\environment(For 32bit OS: - windows xp or vista or windows 7)
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\KasperskyLab\