If you install your new software into the Netscape folder that contains your current version of the product, your old version will be overwritten, but you can still use your existing bookmarks, preferences, and settings. If you wish to keep a copy of the old version as a backup, simply create a new folder for the software you are about to install.
Note: Netscape Navigator for Windows 3.1 will ask if you want to continue using your existing netscape.ini file. Answer Yes if you want to continue using your existing bookmarks and preferences; otherwise the netscape.ini file will be overwritten and existing settings will be lost.