Symantec obviously consider this to be an adware programme. This taken from the Symantec website.
Adware.SpywareNuker is an adware program that downloads advertisements from a server and displays them on the system. It has the ability track your Web browsing habits, and to download new versions of the software with additional functionality without user notification.
Many interesting articles via Google as to whether this is spyware/adware or not among them
this one.
The plot thickens...
This is taken from the McAfee website...
McAfee, Inc. wishes to correct its previous classification of TrekEight, LLC's "SpyWare Nuker" program as adware. The results of an internal investigation by McAfee indicate that prior versions of McAfee's anti-virus and computer security software products inadvertently identified "SpyWare Nuker" as adware, and a "potentially unwanted application." In fact, tests confirm "SpyWare Nuker" does not function as adware, or evidence any virus or Trojan horse behavior.