I am using Netscape 7.2 on Windows XP SP1.
Very often, when I enter a new URL in the navigation bar, or click a link anywhere (including my favorites list), the new page will open in the current window, but at the same time, a new window appears over it.
Usually, the site on the new page is google (my home page)
Sometimes it comes up with a netscape search page, saying no results were found for [random characters]
Other times it gives an error message that "the URL is invalid" before a blank window pops up with [random characters] in the URL bar.