Netscape 7.1 is basically Mozilla 1.4 - if you don't want to use netscape 8, which is essentially firefox 1.07 with a few extra features, then go to mozilla.org and download mozilla 1.7.12 (that last part is "twelve" - .12 is higher than .4) If you go to the newer Moz, you probably will be able to run it just like firefox (which is also based on moz 1.7.12)
Netscape 7.2 is safer than 7.1, and based on the newer Mozilla (1.7.4) engine, but since netscape is not following that path any longer, you might as well go with moz 1.7.12 - it's safer, faster to load, and you'll have almost no learning curve, because it pretty much looks and acts like netscaper 7.1 (a few refinements in features, way more secure, and lots of extensions and skins for it, too!)
