A friend of mine sent me a link which turned out to be an "adult site"!!! however, when i clicked on the link (before i knew it was an adult site) i had this new "openDNS" thing that blocked me from accessing that particular site.
There are two possible places where OpenDNS is set up = on your computer or on your router (if you are using one). You didn't say if anyone else uses the computer, but if they do it is possible that they have set it up as a security measure (among other things, OpenDNS blocks access to known phishing sites).
I'd suggest you talk to whoever else uses the computer and ask them to remove it.