Thank you for the beer offer - as far as previews go, there's a particular tutorial for Windows 7
here, and possibly other information around the forum that I can't exactly remember, but I took the screenshots in my earlier post using the multi-purpose imageviewer
IrfanView. It's free to download, just install, run and press C for capture. You'll get a number of different options, including use of a hotkey or timer, and you can crop the images afterwards.
I'm sure other members will have their own favourite methods though...
[EDIT]
http://vintage-erotica-forum.com/t24...ew-images.html is the 'other information' I was thinking of - which turns out to be Image Grabber II. My suggestions were just simple frame grabs; another one would be, for VLC users, press <shift>S.
[NOTHER EDIT]
I see your own DepositFiles link has an automatically generated preview. You could just cheekily save the images off that as it goes by - in Firefox I just drag and dropped them.