I had run other scan like AdAware and now just re-scan with Spybot SD 1.4 in Normal mode for my Win 2000 Prof stand alone desktop. Surprisingly there is one finding and as follows:-

Windows.ActiveDesktop: User settings (Registry change, nothing done)
HKEY_USERS\S-1-5-21-2052111302-1078145449-839522115-1000\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop\NoHTMLWallPaper!=W=1


--- Spybot - Search & Destroy version: 1.4 (build: 20050523) ---

2005-05-31 blindman.exe (1.0.0.1)
2005-05-31 SpybotSD.exe (1.4.0.3)
2005-05-31 TeaTimer.exe (1.4.0.2)
2006-08-17 unins000.exe (51.41.0.0)
2005-05-31 Update.exe (1.4.0.0)
2006-02-06 advcheck.dll (1.0.2.0)
2005-05-31 aports.dll (2.1.0.0)
2005-05-31 borlndmm.dll (7.0.4.453)
2005-05-31 delphimm.dll (7.0.4.453)
2005-05-31 SDHelper.dll (1.4.0.0)
2006-02-20 Tools.dll (2.0.0.2)
2005-05-31 UnzDll.dll (1.73.1.1)
2005-05-31 ZipDll.dll (1.73.2.0)
2006-08-11 Includes\Cookies.sbi (*)
2006-08-11 Includes\Dialer.sbi (*)
2006-08-11 Includes\Hijackers.sbi (*)
2006-08-11 Includes\Keyloggers.sbi (*)
2004-11-29 Includes\LSP.sbi (*)
2006-08-11 Includes\Malware.sbi (*)
2006-08-11 Includes\PUPS.sbi (*)
2006-08-11 Includes\Revision.sbi (*)
2006-08-11 Includes\Security.sbi (*)
2006-08-11 Includes\Spybots.sbi (*)
2005-02-17 Includes\Tracks.uti
2006-08-11 Includes\Trojans.sbi (*)

... Unquote

In my "Windows Task Manager", the "Task Manager Tab' is now back that is not grey out. Please let me know what I should do next with the Spybot result, thanks