When I tried to instal postgres at the end I got eror saying "Failed to instal postgre". And after that I did all steps from FaQs and wanted to try to instal it again, but I can't uninstal old postgres because it says its instaled (before it said failed), but in "panel>>programs" there isn't postgres (but it is in c/programfiles) and I can't uninstal it. When I tried to delete folder it said program running and I can't delete it. (I deleted postgres user). So how to fully delete postgres, that I could instal new one?