Fixing error after changing wordpress permalinks

Some of us gets this stupid error after changing permalinks form on local server we find that the links is not working even if we tried to undo the permalinks form to our old one! here is how to solve this annoying problem :

1- on your local server folder search for httpd.conf.
2- use notepad++ ( or your beloved text editor ) to open the file for editing.
3- search within file for this line "# LoadModule rewritemodule modules/modrewrite.so" and remove #.
4-save the file then restart your server. hurray!