I'm using LyX for some Maths coursework, I've installed LyX with MiKTeX twice now (re-installed after first encountering this problem) but I'm still getting the same problems.
Basically none of the classes it uses are available. When I load it up it first pops up saying:
The selected document class Article (Standard Class) requires external files that are not available.
I am sure it's at least tried to install these files as I saw it come up in the installer's output.. Is this a common problem that anyone knows how to solve?