5
In that case it sounds like some files are missing; there should definitely be user.php in your /htdocs/xoop/ folder.
You should have a structure like:
/htdocs/xoop/cache/
/htdocs/xoop/class/
etc, through to
/htdocs/xoop/uploads/
/htdocs/xoop/admin.php
/htdocs/xoop/backend.php
/htdocs/xoop/banners.php
etc, through to
/htdocs/xoop/xmlrpc.php
/htdocs/xoop/xoops.css
Hope this helps