Oh man! There's a lot there! This is bound to slow you down.
First, go into the options of Clean Sweep and/or System Works, and uncheck 'start up Clean Sweep/Safe Sweep etc. when Windows starts'.
I further don't think you should let Norton System Doctor start up automatically. It's a pain. Disable that as well.
Then do this:
Go to Start/run, and type msconfig.
On the Startup tab, uncheck EVERYTHING, EXCEPT for the following items
Internet Answering Machine Startup Group "C:\Program Files\CallWave\IAMSETUP.EXE" -start
SystemTray Registry (Machine Run) SysTray.Exe
LVComs Registry (Machine Run) C:\WINDOWS\SYSTEM\LVComS.exe
NAV DefAlert Registry (Machine Run) C:\PROGRA~1\NORTON~1\NORTON~2\DEFALERT.EXE
Norton eMail Protect Registry (Machine Run) C:\PROGRAM FILES\NORTON SYSTEMWORKS\NORTON ANTIVIRUS\POProxy.exe
mdac_runonce Registry (Machine Run) C:\WINDOWS\SYSTEM\runonce.exe
ScanRegistry Registry (Machine Run) C:\WINDOWS\scanregw.exe /autorun
LoadPowerProfile Registry (Machine Run) Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
Norton Auto-Protect Registry (Machine Run) C:\PROGRA~1\NORTON~1\NORTON~2\NAVAPW32.EXE /LOADQUIET
SymTray - Norton SystemWorks Registry (Machine Service) C:\Program Files\Common Files\Symantec Shared\SymTray.exe "Norton SystemWorks"
LoadPowerProfile Registry (Machine Service) Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
SchedulingAgent Registry (Machine Service) C:\WINDOWS\SYSTEM\mstask.exe
Click OK, close Msconfig, and reboot (important!)
Download and install <A HREF="http://www.lavasoftusa.com/index.html">Ad-Aware</A> . This is a program which scans your system for spyware.
After having downloaded AAW, also download the latest Signature file (Reflist.sig) :
http://www.lavasoftusa.com/ls/reflist.zip
Unpack it to the Lavasoft Ad-Aware folder in Program Files, and have it overwrite the one that's there.
Then have your drives and registry scanned for spyware, check all found files and reg keys, click continue, and have them removed.
Reboot one last time.
Your computer will thank you for this, and you'll be amazed about how much more smoothly your system will run.
Good luck,