A virus purger was a powerful top of the line computer virus sold by the Weyland-Yutani Corporation capable of wiping AI's from computer systems. In 2159, Chris "Hoop" Hooper used a virus purger to wipe Ash's program from the Narcissus computers, effectivly killing him. After removing the purger from the computer, Hoop smashed it even though he knew that Ash wasn't really inside of it.