RMySQL installation problem

Prof Brian Ripley schrieb:

On Thu, 15 Nov 2007, Tao Shi wrote:
  
The 'specified module' was specified in the popup!  (Windows' users should 
be used to the arcaneness of the error messages.)

Assuming you actually have MySQL installed, you need to make sure 
libmysql.dll is on the PATH.  It's in the mysql\bin directory, so 
installing MySQL would normally put it on the PATH.
  

I tried to install the package too, and I can confirm that there is the
same error.
the ...\library\mysql\libs is in the path
I copied an executable file into the directory named test123.exe
and used Start-> execute test123.exe
The program was executed

controll test:
I deleted the exeutable file
and used Start-> execute test123.exe  again
result
file not found.

so the path is ok but it isn't working

Did I miss something else?
Regards Knut