Swiss Kauboy

This problem is still not solved. Take an image on a webpage with a transparent background. This could for instance be the "Google" logo in the middle of the page of www.google.com. If I right-click this and say copy image it will be in the clipboard with a transparent background. I can check this by pasting it into an application like paint.net - works like a charm, transparency retained. However, if I paste it into PowerPoint, the background becomes black. This is *really* annoying.