This should work if you replace "your path" with your installation path for BDSup2Sub.
Code:
"C:\Program Files (x86)\Java\jre6\bin\java.exe" -jar "your path\BDSup2Sub.jar"
Anyway, something went wrong with your Java installation as neither the PATH nor the association seems to be set up correctly.
Maybe you should consider deinstalling Java and reinstalling JRE 6 from
here.