Brandishing your holy symbol, go outside. Open up your computer's casing. Be sure not to touch any of the computer's inner components as the demon may then channel into your body. You must now blow dust out from inside your computer. Make sure to get as much dust out of the machine as possible.
Dust acts as an insulator from holy energies.
When the demon notices the dust is gone, it may get angry. This demon pushed the chair in the background over. Place the casing back on the computer. When you begin the rest of the ceremony, the machine's innards must be sealed from the rest of the world. Witnessing what occurs inside a computer that is being exorcised may cause insanity.