I agree Errol, it's a pain in the arse when people paste HUGE pictures. If it's something I want to look at, I use Ctrl + mouse scroll wheel to zoom out, but that zooms the entire screen so any text on the screen becomes microscopic.
My favourite photo resizing tool is Microsoft Office picture viewer. Just open the photo with Microsoft Office (right click the file, select "Open with" and choose Microsoft Office). Click on "Picture" to see the drop-down menu. Select "Resize" and the rest is obvious.