Unity3d PC version fullscreen error

I created a unity version pc game.

Game development was coded in full screen unconditionally.

Symptoms you do not know the way you are using the full screen display occurs, only unconditionally window mode of computer

Have been performed.

While we try to run the game again on a different computer,

In addition, it runs only in windowed mode unconditionally phenomenon of the unknown also, happens.

If you are using Windows 7, we are using the touch screen panel.

There is no way you are be back to full screen again when it is in window mode.

And, do not even change to window mode in principle.

What should I do now?