My SampleTank preferences are correctly set to "C:\Program Files (x86)\IK Multimedia\SampleTank 2.5\Instruments"
I have a copy of the instrument files in both "instruments" and "Instruments\Band-in-a-box" just to cover both cases.
I have also noticed that when I go to to "Select Hi-Q MIDI synth patch" dialog (the one that says all the instruments are not found) and click on the "Show folder" button, it takes me to "c:\bb\dx settings". I have also put a copy of the instruments files in that folder also, but still they are not found.

Thanks