They are really beginning to become a real pet peeve of mine!  My job requires me to  work on the internet about 8 hours a day.  I have like 2 windows open the beginning of the day, by lunch time I have maybe 35 uninvited  "ads".

 

I know there is pop up ad preventer software but I also know it interferes with other certain software.........MSN is one of them.

 

It is necessary to prepare to leave for lunch earlier than I used to have to because I have to X out my internet groups and there is always something that pops up