Following worked for me,
1) Connect to your wordpress site using FTP(FileZilla)
2) Navigate to the following folder /www/wp-content
3) In wp-content folder you will have PLUGINS and THEMES folder
4) Rename PLUGINS to PLUGINS.HOLD, Rename THEMES to THEMES.HOLD
5) Come to your wp-admin.php page(login page) and login using your username and password.
e.g username :admin, password:admin OR whatever your username and password is.
Hope it will help you.
Junaid.
