Lilypond from DOS prompt

[Jennifer Clark]

I'm using the native Windows version of Lilypond, version 2.6.3, and 
wish to produce PNG output for inclusion in other documents. I can make 
PDFs no problem by double clicking on the relevant lilypond file, but 
when I try to run lilypond from the DOS prompt (to use the PNG option) I 
get the following error;

GNU LilyPond 2.6.3
ERROR: In procedure primitive-load-path:
ERROR: Unable to find file "ice-9/boot-9.scm" in load path

However, typing "lilypond -h" or "lilypond -v" does not produce this error?

Does anyone have any advice on this? I tried using the cygwin version of 
lilypond to produce the PNG output, but something is wrong with the 
fonts, so that doesn't work either.

Thanks in advance,
Jennifer