You could also install the portable version
http://www.irfanview.com/faq.htm#Q7
Quote:
Q: Is there a portable IrfanView version (for USB sticks, CDs etc.)?
A: Yes, EVERY IrfanView version is portable. You can:
1. Copy your existing/installed IrfanView folder to USB stick (recommended), or
2. Use the normal installer and install IrfanView to an USB stick folder, or
3. Use the ZIP version and unzip to a USB stick folder.
(Note: the ZIP version of IrfanView is always available on the website link Other download sites at the bottom of the page).
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