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Error: "Malicious site! The web site has been flagged as a malicious siteand has been blocked on the basis of your security settings"
This error message is generated based on information from Google's own databases, using services such as http://www.stopbadware.org/. The message may appear in English ("STOP! This Website Can Harm Your Computer!") or may not appear at all if you are not indexed by Google or are using a browser that does not go off Google's checks.
If the site implicated is not yours, please refer to Google's help on this subject ((https://support.google.com/websearch/answer/45449/).
If the site is yours please read the advice below.
Actions to be carried out
Check the source code for the published page. There is bound to be additional code compared to pages which are still 'clean'. This may be caused by a malicious iframe or some other included element. Examples:
src='http://domain.xyz/ forum/files/index.php' width='1' height='1' style='visibility: hidden;' or src="http://domain.xyz/images/RcDxCPn.html"> frameborder="0" width="1" height="1" scrolling="no" name=counter ?".
On the page in question, click on the button "Why has this site been blocked?" and follow the instructions or click on the link to http://support.google.com/webmasters/bin/answer.py?answer=163633