Easiest way, and saves a lot of bother is just to hit the "Print Screen" key, then mimimise and open MS Paint, then select "Paste" and your screenie should appear right there, then save to whereever you want.
Not sure if some people get crashes when minimising but I never had a problem with it (so far).
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Formerly of U-13, 1st Flot. Back in the days of the WPL and SH2.
Current career : OberLeutnant z. S. Werner Faust of U-707 (Type VIIC) 13th Flot. St. Nazaire.
U-707 Patrol Logs at
http://grimnigel.blogspot.com/