wxdraw in Windows 7



Dear all,
I run wxMaxima (version information see below) under Windows7 ultimate sp.1.
Whenever I want to use a routine which uses gnuplot (eg. wxdraw2d,...) 
Maxima quits with following message:



I tried to re- install the whole Maxima- software (including coma.mac 
which I need very often), tried to run wxMaxima as administrator, too. 
Nothing changed.
I don't know what to do any more. Can anyone help me? Thanx a lot!

Maxima- version info:


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