[Air-L] Screen casting software recommendations?

Hi Everyone, I¹m looking for screen-casting software recommendations for pcs for students to install on their own computers. (I have Quicktime for my mac users) I have looked online. Camtasia at US$300 is too expensive for the 45 minutes per computer I need. I need something easy to use, similar to Quicktime that is easily/quickly installed and easy to use. Camstudio seems to have malware issues according to several searches and comments in this PC World article I found. http://www.pcworld.com/article/2862985/how-to-create-and-distribute-an-instr uctional-screencast-video-for-free.html Appreciate any help, Jackie Militello | Hong Kong University | School of English