i dont know if im reading this right but from what i understand you can load sampletank and in the instrument selection window of sampletank youcan only see the drums and no other subcatagories?
if this is the issue then make sure that your main sampletank sound directory in windows explorer has all the sound where the drums are located...
otherwise if that is not the case then while you are in sampletank click on the button that says "pref" and set your sample directory one folder befor the drums folder so that it lists all the instruments rather then just the drums...
this problem was probably solvedlong ago though but just for future reference