Hello Steve. I am late to this situation but find it very interesting. Reading through this thread my observation is, sub-consciously you already know what's up. This is why you turn away from certain advice - good advice - where faith and work are involved, and keeping looking for someone else to help you or tell you exactly what's what AND give you a 'quicky-lube' solution.
I also belief it is absolutely possible for a negative entity to use a computer to mess with us. The crux of that sentence is ... Computer as a conduit and it's a personal attack. In my head, and through experience -- who care's why. That Path will just lead you in circles.
Here's what my ... eruhmmm ... 'friend' did in a similar situation. She planted her version of St. Michael's Prayer of Protection on her desktop screen so that on or off and every time she opened her computer it was a protected space. Problem solved immediately. Of course, you have to believe in a Higher Power for this to work. Which Higher Power? Again, who cares... assuming you are assuming that your Higher Power is of The Light.