^^ That's funny because I've recently had a PC related dream, too! I had asked shenanigans about a name change issue and when I had gone to bed--I dreamed about that very thing. My name was changed, although I can't remember to what(and its a shame because it was a cool name!) and I just generally remember having my question answered with something to the affect of, "You can't use that particular name but here I changed your name already to (insert name here)." I was quite upset about it as I had no input on the matter, but then I realized it was just a dream! Now I'm upset because I wish I had remembered the name that was used in my dream because it was pretty cool as far as I remember.
I find it odd though, too, because I usually have dreams of "real" things. In this dream, I was not on my computer. I was just... at PC. That's the best way to describe it, I suppose.The only thing I could see in my dream was the PC layout, me going to my pms and reading it all. There was no "physical" world so to speak as I would normally see such as my computer screen, my fingers typing, etc.
I dream a fair bit, or at least I feel like I do. Most of them are the sort where, when I wake up, I know I was dreaming but there's no way I can remember even then what I was dreaming about.
Try keeping a dream journal. I know you said you can't even remember your dream the moment you wake up, but I'm telling you. Keep a notepad by your bedside or something and when you wake up after your dream write down everything that you can remember. Overtime you'll most likely be able to remember more and more of your dream. That's actually first step to lucid dreaming!
On a similar note, whenever I'm asleep and I realize I'm in a dream I immediately wake up. Sometimes I am able to, if I get back to sleep quickly enough, return to the dream in the same spot(or maybe slightly forward in time) as I left. Other times I enter a completely new dream that might be slightly related to the last one or have nothing in common whatsoever. It's fascinating to me, really.
I also have dreams where I am completely unable to control my body and will do ridiculous things such as fly around the room(or area I'm at outside) at breakneck speed. Or I'll jump and wind up hundreds of feet in the air and fall down slowly. Sometimes I'm only able to take a few steps before I crumple to the ground as if I am unable to walk. And more often than I'd like I have dreams where I'm either walking up or down a particularly steep hill and fall down it. The oddest part about these dreams is that they feel so real. That is, I can feel the sensations that would occur as if I was actually experiencing this things in real life--or at the very least I feel how I perceive these sensations to feel because I can't say any of these things have actually happened for me to know how they would feel.