Question I cant change color

Hi,
Im new to Unity and to posting for help on forums but after some hours of googleing and trying myslef im putting my hopes here on this forum. Thanks in advance to the one who can help me with this one.
So i create different materials in unity and giving them diffrent coloros but suddenly i cant do that anymore:
A new window pops up and all i can do is close it.
Whats wrong?

 

Ive tried to reinstall diffrent kinds of Unity with no luck. When i press the color panel to change color i get this window called "color" and cant do anything. Help!