[XeTeX] Compiling a .tex using the tikz package.

[Easter Sunshine]

I have attached graph.tex, which compiles on LaTeX with pdflatex just fine, but I run into an error when I try xelatex. I have attached a log file as well. I am using texlive 2007. I am hoping to have this graph compile on XeLaTeX for inclusion in a larger document.

The error is:

Package pgfsys Info: Driver file for pgf: pgfsys-xetex.def on input line 845.
! Package pgfsys Error: Driver file ``pgfsys-xetex.def'' not found..

Actually, there are a lot of such files here: http://www.ctan.org/tex-archive/graphics/pgf/generic/pgf/systemlayer/ but I have no idea what I can do with them...

Thank you.

Easter Sunshine.

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