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
95/98/ME/NT/2000 computer.
POW watches and waits for one of those nasty windows -- then closes
them immediately