Mi date una controllata al log di HijackThis?
Comportamento "strano" in avvio....

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 18.16.07, on 30/12/2008
Platform: Windows XP SP3 (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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Windows Defender\MsMpEng.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\ZoneLabs\vsmon.exe
C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\spoolsv.exe
c:\programmi\file comuni\logitech\lvmvfm\LVPrcSrv.exe
C:\Programmi\File comuni\Acronis\Schedule2\schedul2.exe
C:\Acer\Empowering Technology\admServ.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\WIDCOMM\Bluetooth Software\bin\btwdins.exe
C:\Programmi\FreePOPs\freepopsservice.exe
C:\Programmi\FreePOPs\freepopsd.exe
C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Programmi\File comuni\Nero\Nero BackItUp 4\NBService.exe
C:\Programmi\File comuni\NMSAccessU.exe
C:\WINDOWS\system32\PSIService.exe
C:\Programmi\SiteAdvisor\6261\SAService.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\TUProgSt.exe
C:\Programmi\File comuni\Softwin\BitDefender Communicator\xcommsvr.exe
C:\Programmi\File comuni\Softwin\BitDefender Scan Server\bdss.exe
C:\WINDOWS\system32\ElkCtrl.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Programmi\FreePOPs\freepopsd.exe
C:\PROGRA~1\LAUNCH~1\QtZgAcer.EXE
C:\Acer\Empowering Technology\ePower\ePower_DMC.exe
C:\Programmi\Windows Defender\MSASCui.exe
C:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\system32\lvcomsx.exe
C:\WINDOWS\system32\wbem\unsecapp.exe
C:\Programmi\IncrediMail\bin\IMApp.exe
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\system32\notepad.exe
C:\Programmi\Malwarebytes' Anti-Malware\mbam.exe
C:\Documents and Settings\Adolfo\Documenti\programmi e applicazioni\HiJackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.google.it
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://kataweb.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://www.google.it
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.it
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://windowsupdate.microsoft.com/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: IE7Pro - {00011268-E188-40DF-A514-835FCD78B1BF} - C:\Programmi\IEPro\iepro.dll
O2 - BHO: (no name) - {089FD14D-132B-48FC-8861-0048AE113215} - C:\Programmi\SiteAdvisor\6261\SiteAdv.dll
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\Program Files\Real\RealPlayer\rpbrowserrecordplugin.dll
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre6\bin\ssv.dll
O2 - BHO: Guida per l'accesso a Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Programmi\File comuni\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - C:\Programmi\Google\Google Toolbar\GoogleToolbar.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Programmi\Google\GoogleToolbarNotifier\5.0.926.3450\swg.dll
O2 - BHO: Windows Live Toolbar Helper - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Programmi\Windows Live Toolbar\msntb.dll
O2 - BHO: Google Dictionary Compression sdch - {C84D72FE-E17D-4195-BB24-76C02E2E7C4E} - C:\Programmi\Google\Google Toolbar\Component\fastsearch_219B3E1547538286.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_plugin.dll
O2 - BHO: EpsonToolBandKicker Class - {E99421FB-68DD-40F0-B4AC-B7027CAE2F1A} - C:\Programmi\EPSON\EPSON Web-To-Page\EPSON Web-To-Page.dll
O3 - Toolbar: EPSON Web-To-Page - {EE5D279F-081B-4404-994D-C6B60AAEBA6D} - C:\Programmi\EPSON\EPSON Web-To-Page\EPSON Web-To-Page.dll
O3 - Toolbar: McAfee SiteAdvisor - {0BF43445-2F28-4351-9252-17FE6E806AA0} - C:\Programmi\SiteAdvisor\6261\SiteAdv.dll
O3 - Toolbar: Windows Live Toolbar - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Programmi\Windows Live Toolbar\msntb.dll
O3 - Toolbar: &Google Toolbar - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - C:\Programmi\Google\Google Toolbar\GoogleToolbar.dll
O4 - HKLM\..\Run: [LVCOMSX] C:\WINDOWS\system32\LVCOMSX.EXE
O4 - HKLM\..\Run: [LogitechCameraService(E)] C:\WINDOWS\system32\ElkCtrl.exe /automation
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [] C:\Programmi\FreePOPs\freepopsd.exe
O4 - HKLM\..\Run: [LManager] C:\PROGRA~1\LAUNCH~1\QtZgAcer.EXE
O4 - HKLM\..\Run: [ePower_DMC] C:\Acer\Empowering Technology\ePower\ePower_DMC.exe
O4 - HKLM\..\Run: [Windows Defender] "C:\Programmi\Windows Defender\MSASCui.exe" -hide
O4 - HKLM\..\Run: [ZoneAlarm Client] "C:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKCU\..\Run: [IncrediMail] C:\Programmi\IncrediMail\bin\IncMail.exe /c
O4 - HKCU\..\Run: [EPSON Stylus DX5000 Series] C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATIBVE.EXE /FU "C:\DOCUME~1\Adolfo\IMPOST~1\Temp\E_S8.tmp" /EF "HKCU"
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.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')
O8 - Extra context menu item: &Windows Live Search - res://C:\Programmi\Windows Live Toolbar\msntb.dll/search.htm
O8 - Extra context menu item: Add to Windows &Live Favorites - http://favorites.live.com/quickadd.aspx
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Invia a periferica &Bluetooth... - C:\Programmi\WIDCOMM\Bluetooth Software\btsendto_ie_ctx.htm
O8 - Extra context menu item: Scarica con Download &Express - C:\Programmi\Download Express\Add_Url.htm
O9 - Extra button: IE7Pro Grab and Drag - {000002a3-84fe-43f1-b958-f2c3ca804f1a} - C:\Programmi\IEPro\iepro.dll
O9 - Extra 'Tools' menuitem: IE7Pro Grab and Drag - {000002a3-84fe-43f1-b958-f2c3ca804f1a} - C:\Programmi\IEPro\iepro.dll
O9 - Extra button: IE7Pro Preferences - {0026439F-A980-4f18-8C95-4F1CBBF9C1D8} - C:\Programmi\IEPro\iepro.dll
O9 - Extra 'Tools' menuitem: IE7Pro Preferences - {0026439F-A980-4f18-8C95-4F1CBBF9C1D8} - C:\Programmi\IEPro\iepro.dll
O9 - Extra button: Inserisci blog - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Programmi\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: Inserisci &blog in Windows Live Writer - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Programmi\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.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: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{970FE5E6-15A7-4E60-AE3D-6A4E6A080241}: NameServer = 192.168.1.1
O23 - Service: Acronis Scheduler2 Service (AcrSch2Svc) - Acronis - C:\Programmi\File comuni\Acronis\Schedule2\schedul2.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: avast! Antivirus - ALWIL Software - C:\Programmi\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
O23 - Service: avast! Web Scanner - ALWIL Software - C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
O23 - Service: AdminWorks Agent X6 (AWService) - Avocent Inc. - C:\Acer\Empowering Technology\admServ.exe
O23 - Service: BitDefender Scan Server (bdss) - Unknown owner - C:\Programmi\File comuni\Softwin\BitDefender Scan Server\bdss.exe
O23 - Service: Bluetooth Service (btwdins) - Broadcom Corporation. - C:\Programmi\WIDCOMM\Bluetooth Software\bin\btwdins.exe
O23 - Service: FreePOPs - Unknown owner - C:\Programmi\FreePOPs\freepopsservice.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: Logitech Process Monitor (LVPrcSrv) - Logitech - c:\programmi\file comuni\logitech\lvmvfm\LVPrcSrv.exe
O23 - Service: Nero BackItUp Scheduler 4.0 - Nero AG - C:\Programmi\File comuni\Nero\Nero BackItUp 4\NBService.exe
O23 - Service: NMSAccessU - Unknown owner - C:\Programmi\File comuni\NMSAccessU.exe
O23 - Service: ProtexisLicensing - Unknown owner - C:\WINDOWS\system32\PSIService.exe
O23 - Service: Servizio SiteAdvisor (SiteAdvisor Service) - Unknown owner - C:\Programmi\SiteAdvisor\6261\SAService.exe
O23 - Service: TuneUp Drive Defrag Service (TuneUp.Defrag) - TuneUp Software - C:\WINDOWS\System32\TuneUpDefragService.exe
O23 - Service: TuneUp Program Statistics Service (TuneUp.ProgramStatisticsSvc) - TuneUp Software - C:\WINDOWS\System32\TUProgSt.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe
O23 - Service: BitDefender Communicator (XCOMM) - Softwin - C:\Programmi\File comuni\Softwin\BitDefender Communicator\xcommsvr.exe
O24 - Desktop Component 1: Aqua Real - 7db39a0d-580f-4be9-9195-8bfcd226f6c2

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End of file - 11254 bytes

Ciao

Il log è pulito, riscontri problemi?

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Forse, (anzi, senza forse) 2 antivirus sono troppi........ (BitDefender + Avast!)
Disistallane 1.

Posta un nuovo log di HJT.

Ciao.
Il log è bello pulito.
Se hai il cd originale di Windows, fai cosi:
Inserisci il cd nel lettore.
Poi fai :
Start\Esegui\ copia incolla questa stringa: sfc /scannow e primi invio.
Quando ha finito, riavvia il pc.
Questa procedura, dovrebbe ripristinare o correggere eventuali file corrotti del S.O.

Potresti anche tentare un Ripristino configurazione Sistema, e scegliere una data in cui eri sicuro che non avevi problemi.
Fai attenzione, se scegli una data piuttosto lontana, perderai i dati o programmi che hai installato dopo tale data.

Per ripristino configurazione di sistema CIAOMIAO,perché l'avevo disattivata quando ho ripetuto le scansioni antivirus e anti-spyware in modalità provvisoria,per escludere che qualche elemento malevolo fosse annidato in un punto di ripristino...
Ho fatto il controllo con il CD di XP come hai suggerito. Un dubbio:devo riavviare con il CD inserito?
Io l'ho rimosso prima del riavvio...Non mi sembra che per il "caricamento" delle icone sul desktop sia cambiato granché...Per il resto vedrò nell'utilizzo futuro.
Ciao

Per quello che riguarda il "caricamento" al rallentatore delle icone sul desktop,a beneficio di chi possa trovarsi in una situazione simile,ho risolto così:
Esegui, regedit
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\explorer]
"Max Cached Icons"=.....
Il valore impostato era 2000,che sentendo in giro non sarebbe neanche basso.Io, a step, l'ho portato a 12000,et voila,alla partenza le icone adesso sono tutte visualizzate istantaneamente con l'apparire del desktop.
Per il resto,consiglierei a tutti di scansionare con "Doctor Alex",con il quale ho trovato,fra le altre cose,due simpaticissimi trojan nel registro,che nè Spybot nè Malawarebytes avevano rilevato.Adesso direi che sono tornato alla normalità.
Ciao e buon anno a tutti

Altrettanto.Stammi bene!