Warning somethings not right here

Some members have been getting a Warning sign when logging in and some are getting thrown out on a number of occasions , here is the message they are getting . Help please

Do you have flags from that site?

Take a look at this Google search, especially the first two - http://www.google.com/search?q=33ff&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

Notice this on both of them:
This site may harm your computer.

We Had Sig then we took them away after we looked onto it , is there anything more we can do ?

You need to check all your images on the forum to see if they come from that site. I mean everywhere, posts, signatures, avatars, etc.

Checking from here all seems OK

Thanks Musket and thanks Sig for your help , looked into the pictures and taken away all the dodgy ones , seems that all is fine now , appreciate your help . I,ll mark this solved now .