Michel, while you are in ACR processing your raw image, you should notice a line of text at the bottom of the screen telling you how the image will open in PSE. That line is actually a link. If you click on it, a dialog box will open where you can make changes as to how you want the image to open. It is there that you choose the color space that you want. A better color space would be ProPhoto RGB, which is a much larger color space than Adobe RGB. BTW, whatever setting you choose actually becomes the default for future raw images, until you change it again.