open paint, photoshop, what ever you got and minimize
get the problem, hit the prt scrn key
go back to paint, etc
edit > paste ( or paste as new image)
save as a gif, bmp, png or jpg
upload to a photo hosting site (photobucket, imagshack, etc <both are free)
copy the direct link (or http link) generated after you upload the pic -
come back here and click the tree icon, paste the address in