Im a newbie, so now we have that sorted out. After installing everything worked fine. Then i configured one thing in WP-admin - Piwik and pressed save After that only the code of the page is visible. The thing i pressed and after that saved, said something like "only do this if you are certain... bla bla". I wasnt certain but saved anyway and now not even after a new install of wp piwik, i can access anything within wp admin. The only thing visible is the code of the page im accessing.
Is there a way to configure the database and get things on the run again?