Some software (programs especially downloaded freeware))is loaded with cookies that spy on you and report back over the net to computers (robots) that may target you with advertising, spam and other garbage. If spybot removes these cookies in some instances the software program itself may not work. Usually any programs with embedded spyware, you are better off without in any case. When you download software that brings up a "click if you agree" page the fine print often seeks agreement to plant cookies on your computer. Spybot will scan and then list them asking which ones you want to delete.