Ho pravato a inserire il testo minimo indicato da teomat. Questo è quello che mi esce scritto sotto:
This is pdfTeX, Version 3.1415926-2.4-1.40.13 (TeX Live 2012/W32TeX)
restricted \write18 enabled.
This is pdfTeX, Version 3.1415926-2.4-1.40.13 (TeX Live 2012/W32TeX) (INITEX)
restricted \write18 enabled.
(c:/texlive/2012/texmf/web2c/cp227.tcx)
entering extended mode
(c:/texlive/2012/texmf-dist/tex/latex/latexconfig/pdflatex.ini
(c:/texlive/2012/texmf/tex/generic/config/pdftexconfig.tex)
(c:/texlive/2012/texmf-dist/tex/latex/base/latex.ltx
(c:/texlive/2012/texmf-dist/tex/latex/base/texsys.cfg)
! I can’t write on file `texsys.aux’.
l.140 \immediate\openout15=texsys.aux
(Press Enter to retry, or Control-Z to exit; default file extension is `.tex’)
Please type another output file name:
! Emergency stop.
l.140 \immediate\openout15=texsys.aux
! ==> Fatal error occurred, no output PDF file produced!
Transcript written on pdflatex.log.
Running: “C:\texlive\2012\bin\win32\pdftex” –ini –jobname=pdflatex –progname=pdflatex -translate-file=cp227.tcx *pdflatex.ini