cannot log in – or reset password

Try reviewing:
http://codex.ww.wp.xz.cn/Login_Trouble
http://codex.ww.wp.xz.cn/Resetting_Your_Password

You may also have a bad plugin or theme. Try:
– switching to the default theme automatically by renaming your current theme’s folder inside wp-content/themes and adding “-old” to the end of the folder name using FTP or whatever file management application your host provides.

– resetting the plugins folder by FTP or phpMyAdmin.