Here is a list of best free portable screen capture software for Windows. These portable PDF software work exactly like their non-portable counterparts. Plus, due to being a portable software, you do not need to install any of these on PC.
FastStone Capture is a Portable Screen Recorder that can be stored and run entirely from a USB device. It enables users to screen capture from a single region or Window to all running processes on a Windows computer screen.
CamStudio is able to record all screen and audio activity on your computer and save it to a video file or streaming Flash video. You can use it to create demonstration videos for any software program
Auto Screen Capture is a small and portable screen capture utility for gamers, designers, and testers. The application enables you to automatically take screenshots at a chosen interval.
FastStone Capture Portable is a super convenient tool, as it allows to get in one single build a screen capture, an annotator, and an editor, plus a screen and a sound recorder, photo editor, with extensive file format support.