Is there a way to make the game run maximized

everytime i start it .. its not filling up the screen its in some sort of widescreen and off to left.

I've had that problem with Rayman M and it sometimes helped to minimize the game and then open it again, though I'm not sure about Rayman 3.

Well you can play the game fullscreen but the menu text will be in the wrong places, just edit the ubi.ini file found in:
C:\Users\-username-\AppData\Local\VirtualStore\Windows\Ubisoft
Otherwise I don't know. You can try setting the 1 before the resolution in the ubi.ini file to play in total windowed mode if that's better.