Thank you Vivian for forwarding this information to me! It works!
I downloaded "POW" software from the Web site below...I tested it
using About.com (since they advertise on Channel One). I won't use
their sites at school as long as the pop-up windows are there (some
are suggestive about spying). The software blocked every ad.
POW! runs in the background on your Windows
POW watches and waits for one of those nasty windows -- then closes