When typing "localhost\.." the computer wants to connect to internet.

At first: I run win 98 on my standalone computer. I installed Apache 1.3.22 and PHP 4.1.0, edit the files php.ini and httpd.conf and put them at the right place. I doublechecked the files. When typing "localhost\index.html.de" the computer wants to connect to internet. It is possible to open the file "C:\apache\htdocs\index.html.de". I tryed to change my IP to 127.0.0.1 but got an error massage. I changed to 192.168.1.2 but no better result. When trying to open php-files the computer trys to download something I cannot read because the download-window opens and closes many times very fast until I press esc. When the browser opens a php-file he shows nothing. I hope to get help of anyone of you because I worked several days on it and have no further idea how to solve the problem. Thank You Tim Lüdemann