Disable Autorun In Windows XP, Vista, 7

This trick will help you in disabling Autorun of USB pen drive. If your drive is infected with viruses, then Autorun should be disabled.
1.Click on Start button. Type 'gpedit.msc' in the Search Box to open the Group Policy Editor.
2.Go to Computer Configuration > Administrative Templates > Windows Components.
3.On the right side of the window double click on "Turn off Autoplay" to turn it off.
4.Click on 'enabled' option of 'Turn off autoplay' and apply it to 'all drives'.

Save the changes to disable the autorun of a pen drive.

USB HACKING

Have you ever wondered what your friend has stored in his/ her laptop but wont tell you? well here is how you can find out .. :)

USB Hacking , as the name suggests, is the unauthorised and unauthenticated usage of a computer by the means of a usb drive or in simple words a pen drive.
In this , u do not use the operating system of the target computer for booting ( since you do not know the username and password , it wont let you access the files and folders.)
What we can do is use an operating system stored on a  pen drive for booting purposes. Ubuntu is an example of a free software that can be easily loaded on a pc without previously installing it.
So
Step 1 is to copy the setup of Ubuntu OS on a pen drive.
Step 2. Start the pc . press F2 for change in advanced boot settings. Change the priority of booting in the settings page , Keep ' Boot Via USB ' as the first boot option and restart the PC.
Step 3. Insert the pen drive and boot the pc with the OS on the pen drive.
Thus u can easily access the files and folders on the pc without knowing the password. :)