[PHP-INST] Can't find server or DNS error

[Web user]

When I ran the PHP scripts under the HTTP://localhost  after I had started APACHE 
server, the IE showed "Can't find server or DNS error" ,but MS-DOS command line showed 
the APACHE was OK as "APACHE/1.3.20 (Win32) PHP/4.0.6 runing". PHP works as a server 
module
THE OS is Win98 SE and PWS has been diabled

PLEASE give me any advice!
Thanks
Baker