Is your website getting hacked? Do you find strange files in your webroot directory that say things like H/\C|<@d by <hacker-name/> ? Do you find that folders on your website are suddenly full of files named index.html, index.htm, index.php, index.gi, index.asp, index.aspx and other index pages with any other file extension, all which read H/\C|<@d by <hacker-name/> ? You've been hacked!
Check to see if you have ftp running on your machine. If so, you should try logging into your own machine by ftp and see what you can do on it. If you know your way around ftp, (cd =...