per http://www.irfanview.com/history_old.htm Version 3.90 (Release date: 2004-04-09) Added options for silent install and uninstall (Check help FAQs)
Silent install was added
There are a ton of other useful options/info under the FAQ in the helpfile for the program.
folder: destination folder; if not indicated: old IrfanView folder is used, if not found: "Program Files" folder used
desktop: create desktop shortcut; 0 = no, 1 = yes
group: create group in Start menu; 0 = no, 1 = yes
allusers: desktop/group links are for all users; 0 = current user, 1 = all users
assoc: set file associations; 1 = images only, 2 = select all
Remember to rename the files or the references to match.
Download the app from http://www.irfanview.com/
IrfanView is provided as freeware, but only for private, non-commercial use (that means at home).