If /gif would give me a free program that captures what on my desktop as video then I will make you guys gifs of the greatest tentacle hentai game of all time, Syokushusyoujyo.
Try CamStudio, or just search Free screen capture programs.
whats the op's hentai name?
Mahotama
Hyper Cam 2 works fine, and it puts it into AVI format, which I like. But the other one sounds good too.
SageMan to the rescue again