Program files>City of Heroes>Screenshots is the quickest way I know of.
In the folder mentioned above only when in the 3D environment of the game. The character screen (at the tailor's), however, doesn't create a file automatically when you hit printscreen. It goes into the clipboard and then you'll have to paste it into some other program and save it from that program.
See here: http://paragonwiki.com/wiki/Screenshot
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ty both very much for the help 
Hey guys was just curious where screen shots i take when playing go to. is there a certain file that i should have because i don't see them under my CoH folder.