XnView does not need to be installed on a computer for running it. With some few files on a disk or memory stick it can be run, already.
Please read in topic 'Minimal installation (Windows)' for more details.
This also allows for creating a CD with XnView and images or a slideshow on it which runs on any computer (with Windows installed). The chapter 'Using XnView > Self Starting Slide Shows on CD' in the XnView Online help contains also interesting infos.
Frequently Asked Questions regarding XnView (including Answers)
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