Okay this entry is a bit of a rant and has little to do with marketing but I just needed to say it.
Ad Ware, as it is called, has become a real problem.
If you are not familiar with this subject it probably still impacts you. Some not so nice software folks and website have come up with ways to basically infect your computer with code that makes windows appear from thin air when you surf. They can even put ads on websites that are not really there.
If you download very many things that are promoted as free than you probably got a load of adware with it. Some of the online music services are the worst.
If you suspect your computer is infected I recommend a free scan. Here is the one that use. The product is called [url=http://hop.clickbank.net/?rad5736/noadware]No Adware.[/url] It is simple, free to try, and seems to do the job.