If you want to use the QuickTime Plug-in 2.0 (which is the one that comes with QuickTIme 3), then you need to manually erase the following directory:
\\npqtw\\
It is also essential that you remove dll files named:
npqtw32.dll
npqtw16.dll
Then you can then install this file into the PLUGINS folder of the browser:
npqtplugin.dll
The default directory for Netscape Communicator plugins is
C:\\Program Files\\Netscape\\Communicator\\Program\\plugins\\
Microsoft's Internet Explorer has a similar default directory for its plugins.
If you want to view AVI files in your browser with the QuickTime Plug-in you must remove these files:
npavi32.dll
npavi.zip