Disable the USB Autorun (CD and DVD drives)

1. Click the Start button, then Run and enter "gpedit.msc" without the quotes
2. Go to Computer Configuration -> Administrative Templates -> System
3. Scroll down to "Turn off Autoplay" and double click on it
4. Click on the "Enabled" radio button, then for "Turn off Autoplay on" select "All drives"

It also disables the autoplay for CD and DVD drives.