Netscape Communicator 4.5 changes search engine in Internet Explorer
By: Arie SlobMany people have been complaining that after they installed Netscape Communicator 4.5 the default search engine in Internet Explorer was changed to the Netscape default (Netcenter).
When you installed Communicator 4.5 it it should have presented you with a dialog box "Windows Integration Options", which let you determine, among other things, whether to have Netcenter as your search engine in ALL (including IE) browsers.
Note: This question is apparently only asked if you choose Custom Installation.
To change it back, see Internet Explorer 4 Tips: Change the Default Search Page