What kind of entry is that McAfee entry? What is found exactly?
You can exclude a product from the search as follows:
First of all procede a scan with Spybot - Search & Destroy. Now, mark the item, you want to exclude from the search, with a left-click.
It is marked blue now. Then right-click this entry and select "exclude this product from further searches".
It is also possible to exclude it before the search. Please run Spybot - Search & Destroy in "Advanced Mode" and go to "Settings" -> "Ignore products". There you can tick the checkbox in front of the product you want to exclude from the search.
CDilla and SiteStep are listed to the ignore products by default.
Please see the following thread for more information:
* Why are CDilla & SideStep checked in Ignore Products?