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Whenever you insert a USB drive, CD/DVD, etc into your system, Windows automatically launches an Autorun dialog box which allows you to select an action from the given list. You can browse the content, play media files, etc using Autorun dialog box.

To disable Autorun functionality in Windows:

1. Type regedit in RUN or Startmenu searchbox and press Enter. It'll open Registry Editor.

2. Go to following key:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

If the above key doesn't exist, create it.

3. In right-side pane, create a new DWORD value NoDriveTypeAutoRun and set its value to any of following according to your requirements:

FF - To disable AutoRun on all drives
20 - To disable AutoRun on CD-ROM drives
4 - To disable AutoRun on removable drives
8 - To disable AutoRun on fixed drives
10 - To disable AutoRun on network drives
40 - To disable AutoRun on RAM disks
1 - To disable AutoRun on unknown drives

4. If you want to disable Autorun on a combination of drives, you'll need to calculate sum of the values. For example, if you want to disable Autorun on CD-ROM drives and removable drives, you'll need to set the value to 20+4=24.

5. If you want to restore the Autorun functionality, simply delete the NoDriveTypeAutoRun DWORD value created in Step 3 Or you can set the default value which is given below:

Windows 2000: 95

Windows XP: 91

Windows Server 2003: 95

Windows Vista, Server 2008 and 7: 91

6. If you want to disable Autorun functionality for all users in your system, use the "HKEY_LOCAL_MACHINE" instead of "HKEY_CURRENT_USER" mentioned in Step 2.