There are a couple of things you probably have checked, but it does not hurt to verify this.

You have Poser 9 - Did you install the 32 bit version of DSON?

Have you tried setting the "Writable Runtime" to another runtime as the default you have? From the log it seems you have installed Poser to c:SmithMicroPoserPoser 9. Is this folder writeable? (It should since it is outside the program folders, but asking just to be sure). And is this also the location where you installed the DSON Importer?
The problem you have could be caused by not being able to write the temporary cr2 folder or Poser not being able to access it