context under miktex

["R. Ermers" <r.ermers@hccnet.nl>]

Dear Friends,

I am having problems with Context under Miktex.
The document is processed, but nothing happens.

Instead a tmp file is created, which says the following:
terminologie-Diwan.003.tmp
% terminologie-Diwan.003.top
\unprotect
\setupsystem[\c!n=1,\c!m=1]
\def\MPOSTformatswitch{-alias=metafun --undump=}
\setupsystem[\c!method=2]
\setupsystem[\c!type=mswin]
\setupoutput[pdftex]
\setupsystem[\c!random=1378]
\setupsystem[inputfile=terminologie-Diwan.003.tex]
\protect
\endinput


D:\publicaties\artikelen\artikel-Diwan>texmfstart texexec.rb 
"terminologie-Diwan.003.tex"
unknown file type: texmfscripts
TeXExec | processing document 'terminologie-Diwan.003.tex'
TeXExec | no ctx file found
TeXExec | tex processing method: context
TeXExec | TeX run 1
TeXExec | writing option file terminologie-Diwan.003.top
TeXExec | using randomseed 1378
TeXExec | tex engine: pdfetex
TeXExec | tex format: cont-en
--8bit: unknown option
TeXExec | runtime: 0.063

The perl and ruby versions:
This is perl, v5.8.8 built for MSWin32-x86-multi-thread
(with 33 registered patches, see perl -V for more detail)
Binary build 819 [267479] provided by ActiveState http://www.ActiveState.com
Built Aug 29 2006 12:42:41

ruby 1.9.0 (2005-07-22) [i386-mswin32]

Any help is much appreciated.

Robert