Try investigating this further by hovering over a link in the popup and see if you can find out where it is trying to direct you to Dave. If it is going to Microsoft, then it is them doing it, if it is going to another unrelated site, then you have a problem with a Trojan on your PC more than likely.

I find it hard to believe anyone is going to believe me but will say what I see.

It only pops up when clicking on a forum thread link such as the one I'm on. This is what pops up

Did you know that your Internet Explorer is out of date?

Underneath this it list all 5 browsers used. IE, Chrome, Firefox and a couple of others.

I have just spent 45 minutes using IE9 clicking every link that could be clicked on different sites. On stardock I opened this forum thread and it was ok till I clicked on the second page and up poped the window I'm having a problem with. It has poped up on different forum threads also. I have run a full scan with Malwarebytes, CCleaner and they are clean. The computer is running great and refuse to reformat just for this. It is a pain as I have to move up and close it out but will live with it I guess. I will say it again and yes will be told it has nothing to do with stardock but on the forums it's the only place it happens. OK, i'm done with this and thanks for the replies.

Ahhh, possibly something Stardock has going on WC then, but coded incorrectly as it should not show up when a subscriber is logged in.  Probably need to email support@stardock.com and wait Dave.

I thought it was doing it every time you opened your browser from what you initially posted.