I am experiencing the same problem. I host a Christian Sunday School site for my kindergarten and 1st grade children so that they have a place to go to let them know what we have done in our class and find activities they can do at home that supports the weekly lessons. But recently there have been so may pop up adds that it has made it very difficult to navigate through them. In addition, they have been very inappropriate. Some look like spam adds that say their computer may have a virus and to click to scan their computer. One was a video pop up that advertised Hooters!  The sight used to only have a few adds and they mainly advertised Christian stores or sites, but now I feel embarrassed to let new guests to my class know about my site. I want to keep it a safe place for children and families to visit. Is there anything I can do to insure a more save web environment for my site guests?