Ciao, intanto grazie per la risposta tempestiva!
Ho fixato le due voci:

O4 - HKLM\..\Run: [9xadiras] 9xadiras.exe
O4 - HKLM\..\Run: [2kadiras] 2kadiras.exe

mentre le due seguenti anche se le fixo RICOMPAIONO:
O23 - Service: Avira AntiVir Scheduler (AntiVirScheduler) - Unknown owner...
O23 - Service: Avira AntiVir Guard (AntiVirService) - Unknown owner -

ma in fin dei conti alla fine delle die stringhe Hijack scrive (file missing),
quindi spero che non possano più nuocere.

Invece il mio problema è che, nonostante l'abbia installato, Spybot
non funziona (non si avvia proprio), CCleaner invece l'ho installato ed
ho un po' ripulito, ed mbam non me lo installa neppure...
MA QUANTO E' IMPALLATO IL MIO PC?!??

In buona sostanza, dopo aver fixato le voci consigliate, il PC è ancora
rallentatissimo ed inoltre ESET rileva ancora Olmarik Trojan horse...

Non so davvero che pesci pigliare, che mi consigliate di fare?

ecco l'Hijack attuale:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 9.06.03, on 06/01/2010
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
Boot mode: Normal

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\csrss.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\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\ESET\ESET NOD32 Antivirus\ekrn.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\wdfmgr.exe
C:\Programmi\Vodafone\Vodafone Mobile Connect\Bin\VMCService.exe
C:\WINDOWS\System32\alg.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Java\jre6\bin\jusched.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\Programmi\ESET\ESET NOD32 Antivirus\egui.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Google\GoogleToolbarNotifier\GoogleTo olbarNotifier.exe
C:\Programmi\ADSL\StarModem ADSL USB MODEM\dslmon.exe
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\msco rsvw.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Programmi\Spyware Doctor\BDT\BDTUpdateService.exe
C:\Programmi\Spyware Doctor\pctsAuxs.exe
C:\Programmi\Spyware Doctor\pctsSvc.exe
C:\Programmi\Spyware Doctor\pctsTray.exe
C:\Documents and Settings\Giusy\Desktop\HijackThis.exe
C:\WINDOWS\system32\wbem\wmiprvse.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
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: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: Browser Defender BHO - {2A0F3D1B-0909-4FF4-B272-609CCE6054E7} - C:\Programmi\Spyware Doctor\BDT\PCTBrowserDefender.dll
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\Programmi\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - C:\Programmi\Google\Google Toolbar\GoogleToolbar_32.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Programmi\Google\GoogleToolbarNotifier\5.4.4525 .1752\swg.dll
O2 - BHO: Google Dictionary Compression sdch - {C84D72FE-E17D-4195-BB24-76C02E2E7C4E} - C:\Programmi\Google\Google Toolbar\Component\fastsearch_B7C5AC242193BB3E.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugi n.dll
O3 - Toolbar: Google Toolbar - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - C:\Programmi\Google\Google Toolbar\GoogleToolbar_32.dll
O3 - Toolbar: (no name) - {CCC7A320-B3CA-4199-B1A6-9F516DD69829} - (no file)
O3 - Toolbar: PC Tools Browser Guard - {472734EA-242A-422B-ADF8-83D1E48CC825} - C:\Programmi\Spyware Doctor\BDT\PCTBrowserDefender.dll
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre6\bin\jusched.exe"
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [SiSPower] Rundll32.exe SiSPower.dll,ModeAgent
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [MobileConnect] %programfiles%\Vodafone\Vodafone Mobile Connect\Bin\MobileConnect.exe /silent
O4 - HKLM\..\Run: [egui] "C:\Programmi\ESET\ESET NOD32 Antivirus\egui.exe" /hide /waitservice
O4 - HKLM\..\Run: [ISTray] "C:\Programmi\Spyware Doctor\pctsTray.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [swg] "C:\Programmi\Google\GoogleToolbarNotifier\GoogleT oolbarNotifier.exe"
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Programmi\Spybot - Search & Destroy\TeaTimer.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\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: Avvio veloce di Adobe Reader.lnk = C:\Programmi\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: DSLMON.lnk = ?
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\Programmi\Spybot - Search & Destroy\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search && Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\Programmi\Spybot - Search & Destroy\SDHelper.dll
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
O16 - DPF: {0CCA191D-13A6-4E29-B746-314DEE697D83} (Facebook Photo Uploader 5 Control) - http://upload.facebook.com/controls/...oUploader5.cab
O16 - DPF: {7FC1B346-83E6-4774-8D20-1A6B09B0E737} (Windows Live Photo Upload Control) - http://ile79ile79.spaces.live.com/Ph...d/MsnPUpld.cab
O16 - DPF: {A8482EAF-A1F3-4934-AE3F-56EB195A50BF} (DeskUpdate - Activex Control) - http://support.fujitsu-siemens.de/De...pi/activex.cab
O16 - DPF: {C45B1500-7B63-47C2-AB25-C28CB46AFDEE} (MediaBar) - http://sib1.od2.com/common/musicmana...agerPlugin.CAB
O17 - HKLM\System\CCS\Services\Tcpip\..\{50A2D858-06BC-4898-A0A6-AA4C9E5426FC}: NameServer = 193.70.152.15 193.70.152.25
O18 - Protocol: linkscanner - {F274614C-63F8-47D5-A4D1-FBDDE494F8D1} - (no file)
O23 - Service: Avira AntiVir Scheduler (AntiVirScheduler) - Unknown owner - C:\Programmi\Avira\AntiVir Desktop\sched.exe (file missing)
O23 - Service: Avira AntiVir Guard (AntiVirService) - Unknown owner - C:\Programmi\Avira\AntiVir Desktop\avguard.exe (file missing)
O23 - Service: Browser Defender Update Service - Threat Expert Ltd. - C:\Programmi\Spyware Doctor\BDT\BDTUpdateService.exe
O23 - Service: ESET HTTP Server (EhttpSrv) - ESET - C:\Programmi\ESET\ESET NOD32 Antivirus\EHttpSrv.exe
O23 - Service: ESET Service (ekrn) - ESET - C:\Programmi\ESET\ESET NOD32 Antivirus\ekrn.exe
O23 - Service: Google Software Updater (gusvc) - Google - C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: PC Tools Auxiliary Service (sdAuxService) - PC Tools - C:\Programmi\Spyware Doctor\pctsAuxs.exe
O23 - Service: PC Tools Security Service (sdCoreService) - PC Tools - C:\Programmi\Spyware Doctor\pctsSvc.exe
O23 - Service: Vodafone Mobile Connect Service (VMCService) - Vodafone - C:\Programmi\Vodafone\Vodafone Mobile Connect\Bin\VMCService.exe

--
End of file - 8104 bytes

Grazie mille per l'aiuto! kisssss