I'm going to venture to bet you've got a rogue virus or something similar running either in your browser or on your home system; if it's new enough or unique enough it may not be getting caught by an antivirus/antimalware solution. The main reason I'm leaning toward this is that we don't insert random popups (and never have), nor did me searching through all files on the account for the phrase "rdsa2012" turn anything up - if it's caused by a file on the account, that should have identified it.
I also spent a good five minutes doing nothing but clicking links; I never received a popup warning or notification on either site, which combined with the absence of rdsa2012 in the code of any files within public_html leads me to believe either you've got something bad running on the machine itself, or if you're on a network you don't control that the network owner may be inserting ads on-the-fly (which is a sign of a terrible network operator, but this only applies if it's at a workplace, school, net-cafe, etc).
If it's happening on other systems as well, are they running on the same network? Any of the same plugins? Same browser? The only thing I can confidently say is it's not coming from our end of the connection, but that doesn't help isolate -where- it's coming from unfortunately
Edit: Bit more info, RDSA2012.com is displaying this when you view it directly:
Rdsa2012.com
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This sounds like a plugin or other application causing it; it would also explain why I'm not seeing it, as the Windows 7 install I'm on right now is about 5 days old, with a very limited subset of programs installed, all of which I either personally coded or vetted for ad-serving junk like this