Lilypond Problem

[Prashant Raina]

Dear Han-Wen and Jan,
I'm getting this wierd problem in Lilypond(Windows).
The PDF and PS files are not created but the MIDI file
comes out fine.
The .log file says:
lilypond (GNU LilyPond) 2.0.1
Running usr...
Now processing: `compo.ly'
Parsing...
Interpreting music...
MIDI output to `compo.midi'...
Track ... 
lilypond: warning: no LilyPond output found for
`compo'
Running latex...
Running dvips...lilypond: error: `dvips' failed
(status 1)
lilypond: error: The error log is as follows:
/cygdrive/c/DOCUME~1/admin/LOCALS~1/Temp/tmpbeAMnXdvips.errorloglilypond:
warning: Failed to make PS file. Rerun with --verbose
for a trace.
MIDI output to `compo.midi'...

and my .ly file's source is:
\header {
piece="\bf Presto ma non troppo e molto agitato"
}
\score {
\notes \context PianoStaff <<
\context Staff="up" {
\key aes\minor
\time 2/4
aes'8-. aes'-. ces''-. aes'-. bes'-. aes'-. bes'-.
aes'-. des''-. aes'-. des''-. aes'-.
\repeat unfold 6{des''-. bes'-.}
ees''-. ces''-. ees''-. ces''-. ees''-. des''-.
ees''-. des''-. ees''-. des''-. ees''-. 
eeses''-. \appoggiatura{des''16 eeses'' ces''} \repeat
unfold 4{ees''8-. ges''-.}
\acciaccatura{ees''} \repeat unfold 4{ges''-. ees''-.}
}
>>
\midi{
\tempo 4=180
}
}

Please help me out :(
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