Print Screen works for Fallout 3, but not for Oblivion. Yet I also have FO3, Morrowind and Oblivion on an old XP laptop and it works there. The XP is 2007, to old to run Skyrim to find out. If Oblivion works on the old box, then it could be Win7 itself. I will try the F12 for Skyrim. Steam, online or off?
If it is Win7 blocking screenshot, is there a screen capture program out there that can be used during a game?
To bad there is no utility that could convert the Save game image into a jpeg, that would work too.