Got this pop-up from an adfly link. A good old Fake Microsoft scam.
you can do images with the [img] and [/img] commands. Get the image link (i.imgur.com/blablabla.png) and put it between the tags. Should integrate into the site.
and would you look at that, I just got the same popup. http://220.127.116.11/systemerror-win-chx/?phone=+1-(888)-413-0667&