Your site has been blocked because it spreads malicious software, most likely this happens because you got your own computer infected with malware, it read your FTP user & password from FTP program and it modified your site's files. That's how this trojans spread.
You need to clean you sites files than request a review for removal from "attack sites" list, more info here stopbadware.org and here badwarebusters.org .

I've checked and you definitely got a malware/malicious code embedded on your site. Your server was breached.

I can remove the malicious code if you need my services. Then you can contact Google to review your site again...

Yes, your plan of action would be to first sort out the reason WHY, then add your site to google webmaster tools and submit a sitemap file, and also contact Google directly requesting a site re-consideration.
Requesting reconsideration of your site - Webmaster Tools Help

I had the same happen to me... Solution... I purchased better AntiVirus software (AVG), bought a reputable Spyware program, and a reputable Registry cleaner... Did a full scan / clean of my machine... Then uploaded a fresh (uninfected) version of the site... Then changed my FTP details (extremely important). Set up a Google webmaster account and then submitted a review request to Google. Got the site back up after about a week! Yay!

Ghalt, the Google report says your site has 3 pages they test and 2 pages resulted in malicious software being downloaded.

The malicious software is hosted on 3 different domains and 4 other domains passing the malicious software.

These embeds are usually in the header, footer, and index files.
But if they fgot FTP access they could be anywhere.
If you can't find them you may have to start fresh.

If the error message hasn't changed, that message did not says, it's from who. Just login using ftp to have a check.

It's not from google nor your hosting (because normally they would leave a message to ask you to contect them). Its possible your site was hacked - read carefully though I'm not saying "it was hacked" and they just leave a blank message.

the message is just a plain html and nothing else.

you must be careful when uploading a file on your hosting, for example themplate

PatriciaJ, What plugin did you install? I'd like to make sure to secure my blogs so that doesn't happen to me. I also sent you a pm in case you don't see this.

This seems to be very common with Wordpress blogs. The majority of this hacks come from rouge plugins. Always make sure you check the legitimacy before installing, more than 70% of them come with back-doors (according to user reports). Change password, and check logs are a fine way to monitor irregular access.

I once had one of these domain hacks through a plugin, so be warned.

Change hosting (could be compromized) and make sure to filter all user input

- htmlentities() on all output
-file_exists() and isalphanumeric on all dynamic includes
-mysql_real_escape() on all input to the database

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The Best Practices I now use to protect from virus attacks -

When you need to FTP to your server, set up a Temp name and password.

If you are using Filezilla, set the login as Prompt for a Password.

Delete the Temp FTP after use.

On the next time you need to FTP set up the same temp username but a different password, Delete after use.

Never use your host FTP username and password.

Never store any FTP username and password in a text file on your pc

Email
Never open attachments in Emails
I know the jokes are funny but they are not free !!!!
Be very careful of emails supposed to be coming from a friend on Facebook - Before clicking the link look at the email address it comes from or better still log into facebook to see the message.

Delete any emails that come from a source you do not know.

Good luck
David