How to Disable Autorun in Windows XP

To disable autorun in Windows XP Professional, do the following: 

Start > Run > gpedit.msc 
(Left Pane) Computerer Configuration > Administrative Templates > System 
(Right Pane) Set "Turn off autoplay" to "Enabled" 

(In the snap-in, it says, "Note: This setting does not prevent autoplay for music CDs." This means that the audio tracks on the CD will still play automatically--however, it *will* disable autoplay on the "data track" of the CD, which is what runs arbitrary code, like installers for evil DRM software, automatically.) 

To disable autorun of CD/DVD and USB Flalsh Drives in Windows XP Professional/Home Edition, do the following: 

Start > Run > regedit 
Find HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\Policies\Explorer 

Make a new value called NoDriveTypeAutoRun of type DWORD. Make its value 0x000000b1 (hex). 
Reboot to be sure it takes effect. 

To re-enable autorun , go back and set the value to 0x00000091 (hex).

To disable autorun in Flash Drive make its value 0x00000095 (hex).  

To disable autorun in CD/DVD drives and USB flash Drives Make its  value to 0x000000B5 (hex).