The most likely explanation is that the Beamer LaTeX package is not installed.
Since you're on Win 7, you are almost surely using MiKTeX as your LaTeX
distribution. Run the MiKTeX package manager and look for the Beamer entry. If
it's not installed, tell the package manager to install it. Once
Hello,
I'm an inexperienced enough LyX user, I know enough to write up and format a
project report starting from scratch into a nice, usable document, however,
I've never had to anything more complicated than learning shortcuts for
putting in math characters. I'm reasonably computer literate (prob
