peppermi,
we can start from the control panel.
In my case, I just click the "Auto Installer", as soon as the page displays, JOOMLA appears on the front page. I just click on "install" button, answer all the fields required and click "install" button again at the bottom of the page.
Then the progress bar on top counts, at 2% it closes and the error pop-out on the top section.
A step by step instruction for the manual install will be best.
Thanks again.
Robert