"Missing Profile" each time i open a graphic, how do i turn off?

This never happened with the old computer but with the new one after installing Photoshop CS1, each time i load a graphic, i get a popup titled "Missing Profile" saying that the file does not have an embedded color profile. The box asks me to choose to leave as is, assign working RGB, or to choose a profile from a list. What is causing this box to open and how to i keep it from opening from now on? This happens with every graphic and photo that I open.

I like to know.
But you can turn it off under Color Settings. Just choosing the default North American General Purpose should set you up.

That did it, thanx!