Well it is a bit of old news....but i think a lot of people still don't know about it.
A lot of software is "infected" with a spy software.
You can read the story http://grc.com/optout.htm
Here you can find a list with all the infected software.
If you want to use a checker/cleaner follow this link.. http://pub3.ezboard.com/fzorsboardzorscracklinks.showMessage?topicID=10.topic
Here a litle part of the that link: advpack.dll
These seem to be associated with Win OS, at least Win2k from some postings.
This one has an association with Media Player
This one has an association with DirectX
There have been reported blue screens with IE and Outlook from removing
*this means that you cannot delete all of the founded files.
I suggest delete all of the files EXEPT for ADVERT.DLL and AMCOMPAT.TLB.
Get your windows cd and put the ADVPACK.DLL and AMSTREAM.DLL from CAB29 of your cd to the system directory of windows.
This way you are sure you don't have any spy files on your computer and that you have only the originals.
Done this and my computer still works fine..no problems.