Yesterday Google listed my site as an attack site.

I'm running Joomla 1.5 and have a secure login so don't see how I could have been compromised.

I searched my site and could not see any malicious code. I then used dasient.com to do a full scan of the site and they could not find any malicious code. I've used Google's Safe Browsing diagnostic and they returned the following:

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Site is listed as suspicious - visiting this web site may harm your computer.

Part of this site was listed for suspicious activity 1 time(s) over the past 90 days.

What happened when Google visited this site?

Of the 5 pages we tested on the site over the past 90 days, 0 page(s) resulted in malicious software being downloaded and installed without user consent. The last time Google visited this site was on 2010-03-11, and the last time suspicious content was found on this site was on 2010-03-11.
Malicious software includes 15 exploit(s), 1 scripting exploit(s).

This site was hosted on 1 network(s) including AS36351 (SOFTLAYER).

Has this site acted as an intermediary resulting in further distribution of malware?

Over the past 90 days, miltonweb.ca did not appear to function as an intermediary for the infection of any sites.

Has this site hosted malware?

Yes, this site has hosted malicious software over the past 90 days. It infected 11 domain(s), including fp10.jp/, gmarket.co.kr/, ariakarasanat.com/.

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I need someone who knows how to get me OFF the Google blacklist QUICKLY.

PLEASE, only personal responses. ALSO, please only respond if you can do this and are somewhat of a security expert.

Thanks