Fair enough. If a computer can be invested with demonic energy however, surely it can also be invested with angelic energy? After all demons are just fallen angels, so there is no reason why an angel cannot go where a demon is to drive it off. Blessings on the whole seem to be more static defenses, a bit more like barrier spraying against bugs imo (but not computer bugs unfortunately). I would think that people of strong faith and spiritual conviction would be well advised to protect their computer at least with a blessing if the threat is dire.
As to A.I.s surely this is doubly so if you genuinely think they are demonic. I confess I don't think they are. That is not to say that I don't regard them as the next hugely disruptive technology to hit our economy. We have barely become used to smart phones, and now we are getting these new machines that mimic elements of human intellectual labor that have previously been protected from modernization by virtue of their complexity. Worse still, the people using them are effectively training the A.I.s to put them out of a job. The workplace has changed so much since when I grew up in the 1970s, but in 20 years time it might be completely unrecognizable. I would still class that more as "Future Shock" than demonic infestation.