As far as I know, and I am just a beginner in regards to power point, you
can but, you-change-one-you-change-all.
( Tool Bar ), Choose DESIGN > Background Styles. Pick one > Colors. Put you
curser over each selection, pick one you like.
t-4-2
I think the comments color is based on your Windows colors. And, honestly,
I'm not sure that changing those would change the comment colors anyway --
they may be yellow regardless. (I bet Steve knows for sure and will pop in
shortly with information.)