Alert Sound while using FRUIT LINES School game

Yesterday I was trying to use FRUIT LINES School game,
and every time the note was falling from the tree, my computer system besides note sound, would produce sound something like system alert . I was trying everything, but that annoying sound keeps happening :S ...

The rest of the games play great.
It was happening both times when the keyboard was on and when it was off...

How it can be fixed? Before we did not have this problem...

NadiaD wrote: Yesterday I was trying to use FRUIT LINES School game,
and every time the note was falling from the tree, my computer system besides note sound, would produce sound something like system alert . I was trying everything, but that annoying sound keeps happening :S ...

The rest of the games play great.
It was happening both times when the keyboard was on and when it was off...

How it can be fixed? Before we did not have this problem...

Nadia, did you install anything lately?
Do you have MIDI playback coming from the piano in your tuning?
Please, try to completely remove the program from your computer and install it again.
Let me know, if the problem still exists...