Disable Autopaly of USB and Audio CDs

First of all go to Start  Menu then Run and type 
gpedit.msc
press enter

Here you see Group Policy Window .then select Administrative Templates and then System as the from 

above  picture.You will see an item in the right side pane called " Turn off Autoplay".

Double click the item , and set the radio button to Enabled and change the "Turn off Autoplay on"

to All Drives.

Stop Autoplay of USB by Pressing One Key

Most of the viruses enter your computer by  usb flash drive.when we open the usb flash drive through autopaly
the virus enter to your computer. We can stop this by pressing only one key.
while inserting the usb flash drive simply hold the SHIFT Key.This tip also work for CD , DVD  inserting.
Works fine in Windows XP and Windows Vista