DefWatch.exe
(Symantec)
Nortons Definitions Watch Service for Norton Corporarte Edition (NAVCE) on Windows NT4/2000/XP platforms. DEFWATCH monitors the VirusDefs folder for new virus definitions or older virus definitions (rolled back) and upon detection of a change starts the Defwatch Wizard which will attempt to repair quarantined files as well as do the other tasks defined in the Defwatch Wizard.
Recommendation :
Essential leave alone.