What OS is installed? If you have Vista or above you could use your snipping tool to copy the image and save to your desktop, then attach from there. I don't know what I would with my snipping tool. Thing is, attaching from the desktop seems to create that thick grey border and Photobucket doesn't, which I rely on tremendously to create tutorials, canned speeches, etc. Photobucket is my best friend (next to google that is)
In XP you could do the same with paint after you save an image by pressing your prt sc key and pasting to paint and save to your desktop from within paint.
Only thing I don't like about Photobucket is that if you delete the image (or your account) in your account at Photobucket, any image that you have posted anywhere online will be removed since the file path is no longer in existence.