[BD]

There's a program called Pop-up Killer, but it's not all that good. It auto-closes every pop-up window under a certain size. Half of the pop-ups on this site, however, are too big for this program, so they stay open.

Beyond that, there's a firewall program called ZoneAlarm. The later versions all have an option to prevent pop-ups, and it lets you open screenshots and stuff without a problem.