Guys, this is not related to virus on the person's PC!
It's a warning that usually starts with Google flagging the site as dangerous.
I've created a thread about this regarding the 4K Ninjas website. If REDUser has lots of links to it, that may be the cause, however the diagnosis doesn't mention anything about the 4K Ninjas site.
To get rid of this one needs to register with Google webmaster tools and request a de-flag. I've run into this with a site I hosted a forum. Forums engines are sometimes vulnerable and allow virus to plant themselves on your domain, quite weird. However, basing myself on the diagnosis, I think the problems are just links to a certain IMGEHACKS site (phishing to look similar to IMAGESHACK).
Here's the first warning:
And here's the detailed diagnosis:
And here's the thread I created about 4K Ninjas: