Hiya
Well, that looks okay, but lets see:
ScanRegistry: keep
SystemTray: keep
LoadPowerProfile: Power management specifics such as monitor shut-off, system standby, etc. keep
NAV Agent: Introduced with Norton Anti-Virus 2002 to replace Norton Auto-Protect and Norton eMail Protect. With the amount of E-mail borne viruses and those around the web you need it if you're connected
NPROTECT:Norton Protected Recycle Bin from Norton Utilities. Adds an extra layer of safety before you remove deleted files from the Recycled Bin
EM_EXEC: Logitech Mouseware driver. Needed to support some additional functionality of Logitech mice/trackballs
supervisor.exe:
ScriptBlocking: Update to Norton AntiVirus 2001. Detects certain types of script-based viruses without the need for specific virus definitions - such as JavaScript and VBScript. This will help protect you from these viruses even before virus definitions are available.
CSINJECT.EXE: Part of Quarterdeck/Norton CleanSweep -needed for CleanSweep Smart Sweep-Internet Sweep. Can start logging manually if this doesn't load when automatic monitoring is set. Not required
SymTray: Keeps all System Tray icons for Norton SystemWorks together to reduce clutter. SystemWorks includes Norton Anti-Virus, Norton Utilities and Norton CleanSweep
Well, as you only seem to have the one, go to Run and type MSCONFIG. Startup tab. Uncheck the one you don't want, apply and restart.
Also, have you done a cleanup lately, as this could hamper things:
http://www.piersontech.com/07-CleanHardDrive.htm
Regards
eddie