Nothing to do with defragmentation. I scanned my computer with Hijackthis and here is the scan log you requested:
(Note that you can still see something to do with my old Lexmark printer. I uninstalled it and I'm using a Canon printer now.)
Logfile of HijackThis v1.97.7
Scan saved at 11:09:07, on 2004-03-29
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)
Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\LEXBCES.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\LEXPPS.EXE
C:\WINDOWS\System32\pctspk.exe
C:\PROGRA~1\mcafee.com\vso\mcvsshld.exe
C:\PROGRA~1\mcafee.com\agent\mcagent.exe
C:\Program Files\Compaq\Easy Access Button Support\StartEAK.exe
C:\Program Files\Fichiers communs\Smith Micro Shared\FAX\SMLoader.exe
C:\Program Files\ScanSoft\OmniPageSE\opware32.exe
c:\progra~1\mcafee.com\vso\mcvsescn.exe
C:\WINDOWS\system32\appextcb.exe
c:\PROGRA~1\mcafee.com\vso\mcvsrte.exe
C:\Program Files\Fichiers communs\Microsoft Shared\VS7Debug\mdm.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Compaq\Easy Access Button Support\CPQEADM.EXE
C:\Compaq\EAKDRV\EAUSBKBD.EXE
C:\PROGRA~1\Compaq\EASYAC~1\BttnServ.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Program Files\Aide mémoire\Aide mémoire.exe
c:\PROGRA~1\mcafee.com\vso\mcshield.exe
C:\Program Files\Internet Explorer\iexplore.exe
D:\HijackThis.exe
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = C:\Program Files\Copernic Agent\Web\SearchBar.htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: (no name) - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: Copernic Agent - {F2E259E8-0FC8-438C-A6E0-342DD80FA53E} - C:\Program Files\Copernic Agent\CopernicAgentExt.dll
O3 - Toolbar: McAfee VirusScan - {BA52B914-B692-46c4-B683-905236F6F655} - c:\progra~1\mcafee.com\vso\mcvsshl.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [PCTVOICE] pctspk.exe
O4 - HKLM\..\Run: [VSOCheckTask] "c:\PROGRA~1\mcafee.com\vso\mcmnhdlr.exe" /checktask
O4 - HKLM\..\Run: [VirusScan Online] "c:\PROGRA~1\mcafee.com\vso\mcvsshld.exe"
O4 - HKLM\..\Run: [MCAgentExe] c:\PROGRA~1\mcafee.com\agent\mcagent.exe
O4 - HKLM\..\Run: [MCUpdateExe] C:\PROGRA~1\mcafee.com\agent\mcupdate.exe
O4 - HKLM\..\Run: [PrinTray] C:\WINDOWS\System32\spool\DRIVERS\W32X86\2\printray.exe
O4 - HKLM\..\Run: [CPQEASYACC] C:\Program Files\Compaq\Easy Access Button Support\StartEAK.exe
O4 - HKLM\..\Run: [SMSI Loader] C:\Program Files\Fichiers communs\Smith Micro Shared\FAX\SMLoader.exe /PRNDRV
O4 - HKLM\..\Run: [Omnipage] C:\Program Files\ScanSoft\OmniPageSE\opware32.exe
O4 - Startup: Aide mémoire.lnk = ?
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Fichiers communs\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: AppExtender.lnk = ?
O4 - Global Startup: ZoneAlarm Pro.lnk = C:\Program Files\Zone Labs\ZoneAlarm\zapro.exe
O8 - Extra context menu item: Chercher avec Copernic Agent - C:\Program Files\Copernic Agent\Web\SearchExt.htm
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra 'Tools' menuitem: Console Java (Sun) (HKLM)
O9 - Extra 'Tools' menuitem: Démarrer Copernic Agent (HKLM)
O9 - Extra button: Copernic Agent (HKLM)
O9 - Extra button: Related (HKLM)
O9 - Extra 'Tools' menuitem: Show &Related Links (HKLM)
O9 - Extra button: Messenger (HKLM)
O9 - Extra 'Tools' menuitem: Messenger (HKLM)
O16 - DPF: {166B1BCA-3F9C-11CF-8075-444553540000} (Shockwave ActiveX Control) -
http://download.macromedia.com/pub/shockwave/cabs/director/sw.cab
O16 - DPF: {4ED9DDF0-7479-4BBE-9335-5A1EDB1D8A21} (McAfee.com Operating System Class) -
http://bin.mcafee.com/molbin/shared/mcinsctl/en-us/4,0,0,72/mcinsctl.cab
O16 - DPF: {8E28B3A9-FE83-45D1-B657-D5426B81A121} (CustomerCtrl Class) -
http://cs5b.instantservice.com/jars/customerxsigned35.cab
O16 - DPF: {9F1C11AA-197B-4942-BA54-47A8489BB47F} (Update Class) -
http://v4.windowsupdate.microsoft.com/CAB/x86/unicode/iuctl.CAB?37881.7240740741
O16 - DPF: {BCC0FF27-31D9-4614-A68E-C18E1ADA4389} (DwnldGroupMgr Class) -
http://bin.mcafee.com/molbin/shared/mcgdmgr/en-us/1,0,0,16/mcgdmgr.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) -
http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab