I add ad sites to my "hosts" file. It's what a pop-blocker does. My file is in C:\WINDOWS\system32\drivers\etc directory.

127.0.0.1 www.cooffe.com
127.0.0.1 www.rufeng.info
127.0.0.1 www.seekme.biz
127.0.0.1 www.cindycut.com
127.0.0.1 www.foryouclick.com
127.0.0.1 www.hadbest.net
127.0.0.1 www.itsbbb.com
127.0.0.1 www.kanoodle.com
127.0.0.1 www.netster.com
127.0.0.1 ppc.shupin.com
127.0.0.1 www.shuba.info
127.0.0.1 www.yp.com

"What is 127.0.0.1? 127.0.0.1 is the standard IP address used for a loopback network connection. This means that if you try to connect to 127.0.0.1, you are immediately looped back to your own machine. Another name for 127.0.0.1 is localhost."