So, if you click the arrow pointing to the right against "VST" (in your screenshot), what do you see?
There clearly are some VSTs installed (otherwise the arrow would not be there, I think).
That's the point: i see nothign. It's kinda strange... any way, i think i'll reinstall everything on my computer (I'm backing up everything right now) over the weekend, and come back here to tell you what happened.
Thanks!