Enable/Disable Autorun in Removable Media

1) Go to Start-> Run , then type REGEDIT and press enter to open registry editor.

2) To Modify these Registry Settings, Use Regedit and navigate to the following Key

HKEY_CURRENT_USER\Software\Microsoft\windows\CurrentVersion\Policies\Explorer

3) Here you will find a key named "NoDriveTypeAutoRun"  then double click it.

4) The default value for the setting is 95 0 0 0 (for disable). Change the first byte to 91 to enable autotrun. Restart the computer to make the new setting take effect.