You probably want to also check what ad banner is being shown at the top of the page. That message box in the first screenshot is originating from Javascript from a page at pc-on-internet.com (clearly not I-Mockery). The only place that this can really be occurring is in an iframe on the page, which is what I believe the ads are running in at the top of the forums.
It's kind of funny that they've done their page up to look like an actual Windows XP popup but you're running Vista
I bet that it also redirects you if you click on Cancel, too.
Finding out the ad banner should provide enough clues for Rog to remove them from the rotation or complain to the network.
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