you can do this for free:
Right click on the entry you want to get rid of, go to Properties, General, put a check in the box for Hidden, click OK.
or you can Buy something like this:
http://fast-eraser.com/
tho this behavior is indicative of a spyware problem you might want to download and run Hijack This and post your log in the Spyware section in this forum.
Hijack This