Dealing with the Websites
Therefore, the more probable way is to deal with the websites directly. I realise that you’ve already contacted these websites. However, you might not have contacted the right person, or haven’t done it with the right “tone”.
Regarding contacting the right person: information about the people responsible to websites could be obtained from something called a “Whois” report. For example, this website provides such an information:
http://www.whois.net
(you put in the name of the site, for example, for “google.com”, you put “google” in the search box and choose “.com” as your suffix, and get the results. In some cases, it tells you that the information is on another site – that you should get it from – for example http://whois.site.com – you go there and do the same).
This should give the information of the person responsible for the site.
Your next step should be to write the letter (”snail” mail, not an email or at least, not only an email). Let me quote from an article about ReputationDefender mentioned below: “Most people will take materials down just to avoid the hassle of dealing with possible litigation,” says Susan Crawford, an associate professor at Cardozo Law School who specializes in cyberlaw and telecommunications law. “If the letter is sufficiently threatening, [...] the threaten-ee could bring his or her own lawsuit seeking a declaration that what they posted wasn’t unlawful. But, again, most people will just buckle rather than fight back.” (SOURCE: Scott Gilbertson, “Delete Your Bad Web Rep”, Wired, 7 November 2006).
In other words, this should be a letter in Legalese, that sounds threatening enough. This is because besically the site owner’s right to decide to keep the information published, unless a court orders them otherwise.