Wasn't so much a problem as an installation attempt. I never ever blindly click Yes on installation requests unless I know for sure that I want it installed. Also, I never click "Always trust so-and-so" even when I do approve installs. That's thanks to an incident last year where someone was able to trick Verisign into issuing him a certificate stating he was from Microsoft in order to get those who do always trust Microsoft to install his spyware without even seeing the pop-up requesting permission. Microsoft's solution to the problem: "Never click 'Always trust Microsoft' at installation requests." Talk about too little, too late to all the poor fools who already clicked it years earlier.
Sure enough when I read the installation request, I saw IBIS Websearch Tool and knew immediately it was up to no good. A quick Google and you saw what I found with respect to what the site was trying to install. Of course, knowing MS and MSIE, something else may have gotten through that I won't pick up until my next scan (or may never pick up).
That was just a spyware infestation attempt that was so lame it tripped a pop-up asking for approval! There's much more insidious stuff out there. I use Spyware Search & Destroy, btw.
If you use IE (like I do at work), perhaps you or someone else clicked to always trust Cardomain.com the first time you (or they) visited the site, thus giving them permanent permission to install whatever they want on your machine.... including this little gem.