Trojan Virus on Host

I made a site for my client and now there is a Trojan.JS.Redirector.f virus that redirects the page to some spam blog. If you type in http://joanna-levesque.org (without www), you’ll see:

However, if you type in http://www.joanna-levesque.org (with www), you’ll see the correct page:

The client tried re-uploading the whole site to no avail. He had made sure that the files on his computer were virus-free before uploading.