Downloading AdAware or similar to clear the rubbish out of your PC is probably the best option (though if it's a work machine, you may not have the necessary permissions to install it...):
http://www.webattack.com/freeware/security/fwantis
py.html
. You may also want to get a pop-up blocker (elsewhere on the same site), of course, if you block all pop-ups, sites such as this one that partially finance themselves via pop-ups will be out of pocket, as it were. (I always override the blocker when I come here, AB Editor).