I didn't post the entire link only the Domdex part to avoid the issue of others getting the same problem, it's much longer than that (but I have removed it).
I admit to being surprised that running MSE doesn't pick up the repeated threats, as it is mainly adware I'm assuming that the definitions are running ahead of the MSE identification/updates and that the childrens type sites my kids use are particularly targeted by these guys.
I also wonder if the AV interacts with the parental controls I have installed in some way that restricts the identification of viruses.