Locate and double-click on your SYSTEM.INI file. The file should open in the Windows Notepad. (Use Start Button, Find, Files or Folders to locate the file if necessary.)

Scroll to the section marked [drivers], and you'll see one or more lines that start with 'Midi='.
These lines may also have numbers after the word Midi (i.e. Midi1=, Midi2=, etc). Make sure that the line you enter, Midi=vpiano.drv, is NOT the same as any other
line listed. If it is, enter a number after the word Midi that is NOT the same as any other number in use. For example, if you see a line that starts with Midi1=, make
sure your line starts with Midi2=. If you see Midi2=, use Midi3=, and so on. Once done, choose File | Save, then restart your computer. After your computer restarts
try the Virtual Piano again.