Louis thinks his website may have been hijacked. Every time he searches for his website, he gets results that include viagra websites and others. Leo says his site has been hacked, and he's not using the SSH encryption code required by Google. He suspects that his web host, GoDaddy, has a bug in its service. Lou's DNS record has probably also been modified. Leo suggests changing his WebHost password to lock out the hacker.
From the chatroom - there's a bug that allows hackers to redirect results in Google search. Read more here and here. GoDaddy seems to be taking advantage of the bug by offering a "site lock" service for $6 a month rather than fixing the bug.
Leo also says that the site has been modified in order to make the spam results more likely. So it's likely Lou's site has been hacked. Here's what you can do about it: http://stevepenny.com/googleviagraspamhack.html