Don't forget when using Ctrl + F11 they will be in Bmp format, you therefore need to convert them to jpeg (much smaller file). Irfanview can do that for you:
http://www.irfanview.com/
Or better still, use an image capture programme. My current one is fraps:
http://www.fraps.com/
There are plenty of free ones on the market:
http://www.google.co.uk/search?hl=en...+software&meta=