Use adobe pdf printer to print colored pdf

Hi there,

I have a pdf in color which seems to be exported from power point. I'd like to have to of the original pages on a new Din-A4 page.

When I try to use the pdf printer to print 2 pages on one, the check box for printing in shades of grey can not be unchecked. So when I print, the color is gone.

How can I use the pdf printer to print in color, so to produce a pdf with colors?

Many thanks!