Completely disable autorun/autoplay features in Windows XP SP3 [duplicate]

Completely disable autorun/autoplay features in Windows XP SP3 [duplicate]

I'm sure this has been answered before but I'm going to ask again because I couldn't seem to find the answer. A machine has been hit by that nasty little yt8a.exe that autoruns on boot and installs itself on other machines by using the autorun from a USB Key (Thumb Drive). How do I disable it?