Site Compromised?

Could sure use some feedback here, not sure where to start.

Received this from Google,

Below are one or more example URLs on your site which may be part of a phishing attack:

http://www.********* .com/~michaelk/http/www.bankofamerica.com/

Here is a link to a sample warning page:
http://www.google.com/interstitial?url=http%3A//www.**********.com/~michaelk/http/www.bankofamerica.com/

We strongly encourage you to investigate this immediately to protect users who are being directed to a suspected phishing attack being hosted on your web site. Although some sites intentionally host such attacks, in many cases the webmaster is unaware because:

1) the site was compromised
2) the site doesn't monitor for malicious user-contributed content

If your site was compromised, it's important to not only remove the content involved in the phishing attack, but to also identify and fix the vulnerability that enabled such content to be placed on your site. We suggest contacting your hosting provider if you are unsure of how to proceed.

Check you FTP for virus files, that would me my best advise; check also for the logs to your server, and see if someone entered your server (check the IP's that logged to your server).

Hope it helps.

Thanks for the advice Francisca_Carv but all is well, my host was all over it, very helpful bunch.

Thanks all for the help and advice, got a couple of PM's as well, Thank You.

Now for more homework,,, Site Security,,, Gotta luv it,,,