Wear this around your neck. First, the computer must be separated from all electronic devices. If there are electronics nearby, the demon will flee and hide inside one of these until you are done. The best place to bring your computer is outside, in the sunlight. If you have a bug-zapper, be sure to move it indoors.
Isolation is a very important part of the exorcism process.
After moving the beast outside, spend at least half an hour preparing yourself for what's to come. This serves two purposes. By understanding the environment the demon resides in, you are better able to fight the demon. Dislexic is preparing for what's ahead. Dummies books are very valuable at this point.