That's odd, one last try before I can't help any more with it, firstly the "print screen" key is the first key next to F12.
If holding down alt and pressing this key doesn't copy the window to the clipboard then you could just press the print screen key and it will capture the whole image on your monitor, then you can crop it down in paint or any package you want.
If that doesn't help, sorry I can't think of an alternative at the moment.