I have written a Venn diagram metapost file, which I successfully ran on Troy Henderson's metapost previewer while at work.

prologues:=3;

verbatimtex

%&latex

\documentclass{minimal}

\begin{document}

etex

beginfig(1);

draw (0,0)--(200,0)--(200,160)--(0,160)--(0,0);

draw fullcircle scaled 80 shifted (80,80);

draw fullcircle scaled 80 shifted (120,80);

label.lrt (btex $\xi$ etex,(0,160));

label.lrt (btex $A$ etex, (40, 120));

label.llft (btex $B$ etex,(160,120));

endfig;

end;

However, now that I am working on it at home, the error message "no file 'mpx314.aux'" appears when I try to compile it. I have tried it on my older system (Miktex 2.6 running on Vista) and on my laptop (Miktex 2.8 running on Vista Home Premium). Actually, on the laptop I also get a popup telling me that "dvitomp.exe has stopped working" and directing me to the Windows update page. Am I doing something silly, or is this a bug, or what? Thanks kindly.

Joel.