Run SecureLock.exe to start the script.
Insert = Turn the screen black and Lock (Lines 1-3)
End = Turn the screen black (Line 5)
Page Up/Down = Disabled (Lines 7-8)
Print Screen = Select what you want to be captures (Lines 10-13)
AutoHotKey http://ahkscript.org/
To start the script automatically, drop SecureLock.exe in your Startup folder.