how to disable autorun programs from usb stick, to stop some viruses.

install "Update for Windows XP (KB967715)" from:

(for other versions of windows:

Windows XP Professional

-Click Start
-click Run
-type Gpedit.msc , press enter
-navigate: Computer Configuration/Administrative Templates/System.

double click "Turn off Autoplay"
enabled; all drives

same for User Configuration/Administrative Templates/System

also from: (for other versions of windows:

NOTE: you can hold "SHIFT" when insert usb-stick. This should stop autorun too.