1) Make sure IE won't ask to be the default browser by clicking View / Internet Options / Programs and unchecking Internet Explorer should check to see whether it is the default browser. Click OK.

2) Make sure that Netscape Communicator is NOT running.

3) Use Windows NT Explorer to browse to \Program Files\Netscape\Users\ Communicator Profile> 4) Copy Prefs.js (or Prefs if Prefs.js does not exists) to Prefs.old.

5) Edit Prefs.js with notepad and locate ser_pref("browser.wfe.ignore_def_check" , true);.

6) Change true to false and Save and exit notepad.

7) Start Netscape Communicator and reply Yes to the dialog box asking if it should be the default browser.

It that does not work edit your Windows Registry:

1) From the Start menu, select Run

2) Type regedit, press Enter

3) Navigate to HKEY_CURRENT_USER/Software/Netscape/Netscape Navigator/Main

4) Double-click IgnoreDefCheckn and set the value to "no."