On professer layton cant figure out were the 7 squares are

Go on youtube and type in: professor Layton and the curious village puzzle 100 and click on professor Layton and the curious village puzzle #100 seven...
and that will show you how to do it.

This is perhaps the most commonly asked about puzzle on FixYa

The hints give you the location of three of the seven squares and mention that all but one square is at an angle

The hints also give you both the size and angle of two more squares

As an added hint, none of the three small angled squares overlap each other (there's almost no choice on where to put these with this information)

You should now have five squares in place, leaving just two squares to place over eight pins

Remember that each pin can only be used one and that all pins must be used

You can find a picture of the entire solution here if you need it http://professorlaytonwalkthrough.blogspot.com/2008/02/puzzle100.html