Disable USB Autorun to Save PC from USB Viruses

First Way:

• Browse to the following key HKEY_CURRENT_USER\Software\Microsoft\Windows\ CurrentVersion\Policies\Explorer
  
• Modify the value of NoDriveTypeAutoRun to df (hexadecimal)

Second Way:

1.START ->RUN ->Key in 'regedit' to open registry.

2. HKEY_CURRENT_USER\ Software\Microsoft\ Windows\CurrentVersion \Explorer\MountPoints2,

3.Right click 'mountpoints2' and select 'permission'

4.Then click 'Advance',uncheck 'inherit from parent the permission entires that apply to child objects.Include these with entires explicity defined here'.

5.Click 'remove'.'Yes' and 'ok'.