Just tried 7Capture works great ! has "7capture.chm" help file, if you can't open chm upload to http://www.convertfiles.com/convert/ebook/CHM-to-PDF.html
Open 7Capture, select app to take shot of, press Ctrl+PrtScrn
or just PrtScrn for whole desktop.
Save as any image type or pdf.

Right click Save Link/Target As, then rename to .pdf
Capture_Desktop.pdf.png

Attached Files (Click to download or enlarge) (Only available when you are logged in)
7Capture_Desktop.jpg (310.25 KB, 36 downloads)
7Capture_Save_Type.jpg (44.95 KB, 36 downloads)
7Capture.jpg (72.61 KB, 36 downloads)
7Capture_Desktop.pdf.png (630.53 KB, 0 downloads)