Disklavier

We just received delivery of a Mark III disklavier (floppy disk only).  
We turned the volume down as far as we could but it is still too loud 
for us.  From reading various posts, I understand the dkvutilities and 
perhaps some other software, allows one to further reduce the volume of 
midi pieces.  Does anyone know if these will work under Vista?  If not, 
can someone recommend a program that will do the job which works under 
Vista.  I would not object to buying a commercial product for this 
purpose, such as Cakewalk, if I could figure out which version of 
Cakewalk to buy!

Thanks in advance...