Ok, what is happening is you're a victim of Spyware .... happens to everybody - so don't worry.
To solve the problem, download THIS
... run the program, and let the program scan your computer. When it's ready, it should give you a list of things on your computer. Make sure every single item in that list has a tick to the left of it ... then when ready, click finish and those items will be removed from your computer. Don't worry ... everything you remove is safely removable.
Hope that helps, your problem should be solved. I also recommend you run the program atleast once a week - spyware can get installed from no fault of your own, it's just money grabbing companies doing their worst. Best of luck.
- Rocker -