Raduga problem ?

I try the free test edition of Raduga, and I have a problem. When I ask for an action, for exemple to go next song ("N" key) or when I start a jingle by hotkey, the song or the sound become one second after :( The raduga working during 1 second !
Is it my computer or Raduga must have more power computer ? maybe it's because my hard disc is full at 60% ?
Please help me !