NIS 2009 - Spysweeper - Spyware Doctor and Cookies Question ?

I already know that both Spysweeper (V.5.5.7.124) without AntiVirus & Spyware Doctor without AntiVirus are not needed with NIS 2009. Also both have never run together the same time on my computer. When I was running NIS 2008 I would run one of these spywares. When NIS 2009 came out I uninstalled both Spywares, but I still have the download on my desktop (programs are not installed)  just incase I need them since my subscription is good till 2011. But when I did have one or the other installed and running I noticed that when either Spyware software deleted the cookies (and I know cookies are not that important) I would check to see if the cookies were deleted, and they were. I would the follow up with a NIS 2009 Quick Scan and the Quick Scan would hit on the same cookies that Spysweeper or Spyware Doctor would delete. My question is "Why would NIS 2009 hit on tracking cookies that wasn't there ? "