Huh. Do these kind of phobias REALLY extend to even the virtual world? Not being a phallic object (as someone so eloquently put it a page ago), I'm genuinely curious. I've never known anybody with a phobia, so would the OP really be afraid of a spider even if they were a bunch of pixels on a screen? That's wild. But hey, at least Pete says you can get rid of them.

Spiders in video games weren't a problem for me a decade ago (or a few years ago), but technology has caught up with us, and so they are rather realistic in games like Skyrim. The thing is, when someone has a phobia, it can't
really be described as being "afraid" of something. More like absurdly, overpoweringly anxious about specific stuff (like kinds of animals) or other things, like specific social situations and a lot of other stuff. Arachnophobia (and other specific phobias) are rather common though, and unlike social phobias can't really be tied to other emotional conditions.
I think that, unlike people, we don't really perceive any sort of physical differences in spiders (they are another species, after all), so it is easier to develop a generic distaste, because their features appear generic. With people, we are familiar with different kinds of physical attributes and have as easier time with perceiving the differences.
It's kind of interesting, really. My father, who was a sheep-herder for a long time says that he after some time found it at least as easy to recognize sheep by their features as people.
It's nice that you are neutrally curious

EDIT: Curiously, unlike some people here, larger size does not help me dealing with it, at all.