i dont think so .. better u del all files and start a new installation .. same thing ...happen to me right now .. and now am doing a new installation and need to chk chmod ... and am reading security checklist published at joomla help ... http://docs.joomla.org/Security_Checklist_1_-_Getting_Started
Be aware that joomla send your login info. in clear text if you don't have SSL. Don't use it free networks unless you are very sure.