FCKeditor image uploading problem (Windows popout with HTTP Error 404 when i clicked on "browse server")

Hi,
I have installed Drupal 4.7.5 and FCKeditor module for drupal 4.7.x version as well as FCKeditor 2.3.3.
I have done the following:

1. Copy the module fckeditor folder to modules/.
2. Download FCKeditor 2.x from http://www.fckeditor.net and copy the
distribution files (the contents of the "fckeditor" directory from
the FCKeditor distribution file) to modules/fckeditor/fckeditor.

Enable the file browser:
$Config['Enabled'] = true ;

Comment out or remove the
following line in the connector configuration:
//$Config['UserFilesPath'] = '/UserFiles/' ;

Create "File", "Image", "Flash" and "Media"
subdirectory in your drupal files directory.

FCKeditor is able to work with my drupal site. However when i clicked on "browse server", there is a popout windows stating "The page cannot be found" and HTTP Error 404.

I have tried searching for solutions online but no one seem to have the same problem.
Can anyone help?

Thank you!