Thank you Ego and David for the heads up. I definitely don't want any trouble with any lawyer. But I'm not doing anything that has not been done before. I have seen that Microsoft logo used in other sites in white (the way I want it) over a colored background. My problem is that I have not found that logo with a transparent background so I can use it. That's why I decided to learn how to use Paint.NET and try it out for myself.
As for the suggestion Ego gave me, that works great. Thank you very much!