I’m surprised nobody has posted a link to http://www.oldversion.com/ yet. There’s plenty of older Windows 95-capable browsers hat are available for download on the site. Whether they’ll render most contemporary sites out there remains to be seen, though. You can get IE 3.0 on Oldversions, and that edition will render all but the most bleeding edge Web sites.
I used Mozilla 1.6 on an ancient Windows 95-based computer, and although it was slow-ish, it had no problems with every site I visited.