Are you trying to intergrate/install FreiChat into a Custom build website or any other CMS ?
The freichat directory should be inside the website directory which is to be integrated and not outside (\xampp\htdocs)
My best guess would be that you had selected Joomla as the integration driver in the second step of installation and so the corresponding error (due to absence of Joomla)
Please have a look at the basic installation guide here : http://codologic.com/page/node/768
If you have not yet started with the website and just trying to test FreiChat, it is also possible to install FreiChat in a blank page
Are you trying to intergrate/install FreiChat into a Custom build website or any other CMS ?
The freichat directory should be inside the website directory which is to be integrated and not outside (\xampp\htdocs)
My best guess would be that you had selected Joomla as the integration driver in the second step of installation and so the corresponding error (due to absence of Joomla)
Please have a look at the basic installation guide here : http://codologic.com/page/node/768
If you have not yet started with the website and just trying to test FreiChat, it is also possible to install FreiChat in a blank page
Necessity is the mother of all inventions!