pdf-export not working

[Patrick Watzka-Storm]

Hello,
i've worked with lilypond for a few days now and everything went well,
but since this evening I get the following error message in the log file, when
trying to create a pdf-file.
midi output still works without problems.

»gs -q   -dDEVICEWIDTHPOINTS#595.28 -dDEVICEHEIGHTPOINTS#841.89 
-dCompatibilityLevel#1.4  -dNOPAUSE -dBATCH -r1200  -sDEVICE#pdfwrite
-sOutputFile#"E:mmm1.pdf" -c .setpdfwrite -f "E:mmm1.ps"« gescheitert (1)
Fehler: gescheiterte Dateien: "E:\\mmm1\\Neu1.ly"

I have no clue what could be the problem, since I did not change anything on my
XP-System.

Solution would be great.

Have a nice evening

Patrick