I think he’d basically follow the same procedure as in The Apocalypse Codex, when he exorcised the 666 Squadron Lightning, with the additional complication that he’d have to put the laptop in a Faraday cage, to block the BlueTooth, wi-fi and 3G phone signals so that any extra-dimensional critters in the device wouldn’t be able to propagate to other devices. (Naturally, he’d keep the lid closed so that it wouldn’t infect him via the display.)
Or he’d just effect a field-expedient exorcism by shooting it with banishment rounds, or zapping it with a basilisk gun. 
