Popups, what pop… oh yeah! Haven't seen those in years because I did this:

Go into your Internet Options control panel applet and go to the Security tab.
Click on the Restricted Sites icon, then push the Sites button right under that
icon. Add *.bearshare.com to that list.

Also, If you still have Zango on your system (which came with BearShare 5.2 and
up) you can remove it now. Any spyware cleaner should be able to kill that thing.