Ciao,
il mio pc è abbastanza imballato, temo di avere programmi, applicazioni ecc. che rallentano.
Vi posto il file di Hijackthis, mi aiutate a capire cosa c'è che posso eliminare o comunque consigli da darmi?

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 0.48.05, on 29/12/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16762)
Boot mode: Normal

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\system32\svchost.exe
C:\WINDOWS\System32\S24EvMon.exe
C:\WINDOWS\system32\ZCfgSvc.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System32\1XConfig.exe
C:\Programmi\a-squared Free\a2service.exe
C:\Programmi\AntiVir PersonalEdition Classic\sched.exe
C:\Programmi\AntiVir PersonalEdition Classic\avguard.exe
C:\Programmi\WIDCOMM\Software Bluetooth\bin\btwdins.exe
C:\Programmi\File comuni\Microsoft Shared\VS7Debug\mdm.exe
C:\WINDOWS\System32\RegSrvc.exe
C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\igfxtray.exe
C:\WINDOWS\System32\hkcmd.exe
C:\Programmi\Java\j2re1.4.2_02\bin\jusched.exe
C:\Programmi\HPQ\Quick Launch Buttons\EabServr.exe
C:\Programmi\Java\j2re1.4.2_02\bin\jucheck.exe
C:\Programmi\Synaptics\SynTP\SynTPLpr.exe
C:\Programmi\Synaptics\SynTP\SynTPEnh.exe
C:\WINDOWS\AGRSMMSG.exe
C:\PROGRA~1\ALICET~1\SMARTB~1\MotiveSB.exe
C:\Programmi\QuickTime\qttask.exe
C:\Programmi\AntiVir PersonalEdition Classic\avgnt.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Nokia\Nokia PC Suite 7\PCSuite.exe
C:\Programmi\Nokia\Nokia PC Suite 7\PCSync2.exe
C:\Programmi\Alice ti aiuta\bin\mpbtn.exe
C:\Programmi\File comuni\Nokia\MPAPI\MPAPI3s.exe
C:\Programmi\PC Connectivity Solution\ServiceLayer.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Programmi\PC Connectivity Solution\Transports\NclUSBSrv.exe
C:\Programmi\PC Connectivity Solution\Transports\NclIrSrv.exe
C:\Programmi\PC Connectivity Solution\Transports\NclRSSrv.exe
C:\Programmi\PC Connectivity Solution\Transports\NclBCBTSrv.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\File comuni\Microsoft Shared\Windows Live\WLLoginProxy.exe
C:\Programmi\TomTom HOME 2\HOMERunner.exe
C:\Programmi\WinRAR\WinRAR.exe
C:\DOCUME~1\^^^GIA~1\IMPOST~1\Temp\Rar$EX01.266\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://it.msn.com/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Programmi\File comuni\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\System32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Programmi\Java\j2re1.4.2_02\bin\jusched.exe
O4 - HKLM\..\Run: [eabconfg.cpl] C:\Programmi\HPQ\Quick Launch Buttons\EabServr.exe /Start
O4 - HKLM\..\Run: [SynTPLpr] C:\Programmi\Synaptics\SynTP\SynTPLpr.exe
O4 - HKLM\..\Run: [SynTPEnh] C:\Programmi\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [Cpqset] C:\Programmi\HPQ\Default Settings\cpqset.exe
O4 - HKLM\..\Run: [PRONoMgr.exe] c:\Programmi\Intel\NCS\PROSet\PRONoMgr.exe
O4 - HKLM\..\Run: [AGRSMMSG] AGRSMMSG.exe
O4 - HKLM\..\Run: [Motive SmartBridge] C:\PROGRA~1\ALICET~1\SMARTB~1\MotiveSB.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [avgnt] "C:\Programmi\AntiVir PersonalEdition Classic\avgnt.exe" /min
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKCU\..\Run: [PnPUI Registrator] C:\Programmi\Common Files\Sitecom Shared\PnP Universal Installer\PnPUIReg.exe -s
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Programmi\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [PC Suite Tray] "C:\Programmi\Nokia\Nokia PC Suite 7\PCSuite.exe" -onlytray
O4 - HKCU\..\Run: [Nokia.PCSync] "C:\Programmi\Nokia\Nokia PC Suite 7\PCSync2.exe" /NoDialog
O4 - HKCU\..\Run: [TomTomHOME.exe] "C:\Programmi\TomTom HOME 2\HOMERunner.exe"
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\Run: [Network Security] C:\WINDOWS\System32\NSecurity.exe (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: Alice ti aiuta.lnk = C:\Programmi\Alice ti aiuta\bin\matcli.exe
O4 - Global Startup: AutorunsDisabled
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O8 - Extra context menu item: Invia a &Bluetooth - C:\Programmi\WIDCOMM\Software Bluetooth\btsendto_ie_ctx.htm
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\WINDOWS\system32\msjava.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\WINDOWS\system32\msjava.dll
O9 - Extra button: PokerStars - {3AD14F0C-ED16-4e43-B6D8-661B03F6A1EF} - C:\Programmi\PokerStars\PokerStarsUpdate.exe
O9 - Extra button: @btrez.dll,-4015 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Programmi\WIDCOMM\Software Bluetooth\btsendto_ie.htm
O9 - Extra 'Tools' menuitem: @btrez.dll,-4017 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Programmi\WIDCOMM\Software Bluetooth\btsendto_ie.htm
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O14 - IERESET.INF: START_PAGE_URL=http://www.hp.com
O15 - Trusted Zone: http://www.libero.it
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {4F1E5B1A-2A80-42CA-8532-2D05CB959537} (MSN Photo Upload Tool) - http://gfx2.mail.live.com/mail/w1/resources/MSNPUpld.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/MsnMessengerSetupDownloader.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{84A095FF-37EB-4D8F-AC3C-A6F7E334A821}: NameServer = 85.37.17.16 85.38.28.68
O23 - Service: a-squared Free Service (a2free) - Emsi Software GmbH - C:\Programmi\a-squared Free\a2service.exe
O23 - Service: AntiVir PersonalEdition Classic Scheduler (AntiVirScheduler) - Avira GmbH - C:\Programmi\AntiVir PersonalEdition Classic\sched.exe
O23 - Service: AntiVir PersonalEdition Classic Guard (AntiVirService) - Avira GmbH - C:\Programmi\AntiVir PersonalEdition Classic\avguard.exe
O23 - Service: Bluetooth Service (btwdins) - WIDCOMM, Inc. - C:\Programmi\WIDCOMM\Software Bluetooth\bin\btwdins.exe
O23 - Service: Servizio iPod (iPod Service) - Apple Inc. - C:\Programmi\iPod\bin\iPodService.exe
O23 - Service: Intel NCS NetService (NetSvc) - Intel(R) Corporation - c:\Programmi\Intel\NCS\Sync\NetSvc.exe
O23 - Service: RegSrvc - Intel Corporation - C:\WINDOWS\System32\RegSrvc.exe
O23 - Service: Spectrum24 Event Monitor (S24EventMonitor) - Intel Corporation - C:\WINDOWS\System32\S24EvMon.exe
O23 - Service: ServiceLayer - Nokia. - C:\Programmi\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
O23 - Service: SymWMI Service (SymWSC) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\Security Center\SymWSC.exe

Grazie Mille.

Avvia hijackthis, metti la spunta alle voci che andrò ad elencarti e con tutte le applicazioni chiuse e disconnesso da Internet,premi su fix checked
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\System32\igfxtray.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Programmi\Java\j2re1.4.2_02\bin\jusched.exe
O4 - HKLM\..\Run: [Cpqset] C:\Programmi\HPQ\Default Settings\cpqset.exe
O4 - HKLM\..\Run: [PRONoMgr.exe] c:\Programmi\Intel\NCS\PROSet\PRONoMgr.exe
O4 - HKLM\..\Run: [Motive SmartBridge] C:\PROGRA~1\ALICET~1\SMARTB~1\MotiveSB.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKUS\S-1-5-18\..\Run: [Network Security] C:\WINDOWS\System32\NSecurity.exe (User 'SYSTEM')
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office10\OSA.EXE
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\WINDOWS\system32\msjava.dll

Trova e cancella i file in rosso:
C:\WINDOWS\System32\NSecurity.exe
Dai una pulita (registro compreso)con CCleaner http://www.aiutaamici.com/software?ID=11223
Riavvia il computer.
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Scarica ed installa MalwareBytes:
clicca qui per il download : http://www.malwarebytes.org/
esegui una scansione completa del sistema e, una volta terminata la scansione,posta il log che verrà rilasciato in questa discussione.
Assicurati che tutti i files evidenziati siano selezionati e clicca Rimuovi Selezionati Riavvia il pc.
Prima di fare la scansione AGGIORNALO.
*********************************************************************************************************
Vai in "Installazioni Applicazioni" e rimuovi TUTTE le versioni JAVA che trovi, poi fai una pulizia (registro compreso) con CCleaner.
Installa questa:
http://www.aiutamici.com/software?ID=11134
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Fai: Start\Esegui\copia-incolla questo comando: %temp% e svuota la cartella TEMP.

Provvedi a svuotare del suo contenuto la cartella Prefetch :
clicca su Risorse del Computer
clicca su Disco locale C:
cerca, all’interno delle cartelle che saranno visualizzate la cartella Windows, aprila ed, al suo interno, cerca la cartella Prefetch, la apri ed elimina tutte le voci conservate al suo interno ( non eliminare la cartella)
SVUOTA IL CESTINO

Fai una scansione on-line con Bitdefender: (con Internet Explorer)
http://www.bitdefender.com/scan8/ie.html
Elimina tutto quello che trova.
Riferisci se ci sono ancora problemi.