Go to the Start button, click on Run.
Type regedit.
Select HKEY_CURRENT_USER.
Then, Software. chasms.com | registry tweaks
Now, Netscape.
Select Navigator chasms.com | registry tweaks
Now we want to double click on Main.
Now, right click once on Ignore Defcheck. chasms.com | registry tweaks
From the little menu that appears, select Modify.
Change the Yes to No.
That's it, we're through. Now the next time you Open Netscape, it will ask you if you want it to be your default browser.