Windows AutoRun feature is a potential security risk because it automatically runs code when you connect removable devices to your PC.
If you can put up with the inconvenience of doing things manually then it’s safest to disable it.
To disable Autorun

• Go to “HKLM\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\IniFileMapping”
• Create a key called ‘Autorun.inf’.
• Double-click the new key’s (Default) value and Enter the new value ‘@SYS:DoesNotExist’.
• Delete the Registry key ‘HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2′.

Now windows not run any code automatically on CDs, DVDs or removable drives, you will have to manually launch it.