quando accendo il pc non mi escono le icone cosa puo essere successo questo e il log che ho eseguito con hijack:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 21.43.35, on 09/05/2010
Platform: Windows XP SP2 (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\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\spoolsv.exe
C:\Programmi\File comuni\Acronis\Schedule2\schedul2.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Microsoft LifeCam\MSCamS32.exe
C:\Programmi\Microsoft\Search Enhancement Pack\SeaPort\SeaPort.exe
C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\File comuni\Acronis\Fomatik\TrueImageTryStartService.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Analog Devices\SoundMAX\SMax4PNP.exe
C:\Programmi\Analog Devices\SoundMAX\Smax4.exe
C:\Programmi\Acronis\TrueImageHome\TrueImageMonitor.exe
C:\Programmi\Acronis\TrueImageHome\TimounterMonitor.exe
C:\Programmi\File comuni\Acronis\Schedule2\schedhlp.exe
C:\Programmi\DU Meter\DUMeter.exe
C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
C:\Programmi\SweetIM\Messenger\SweetIM.exe
C:\WINDOWS\vVX3000.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Documents and Settings\All Users\Dati applicazioni\Macrovision\FLEXnet Connect\6\ISUSPM.exe
C:\Programmi\HP\Digital Imaging\bin\hpqtra08.exe
C:\Programmi\WinZip\WZQKPICK.EXE
C:\Programmi\Windows Live\Messenger\msnmsgr.exe
C:\Programmi\3\FastMobileModem\MMModem.exe
C:\Programmi\Malwarebytes' Anti-Malware\mbam.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\Trend Micro\HijackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://it.rd.yahoo.com/customize/ie/defaults/sp/msgr9/*http://it.search.yahoo.com
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
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://it.rd.yahoo.com/customize/ie/defaults/su/msgr9/*http://it.search.yahoo.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - URLSearchHook: SweetIM ToolbarURLSearchHook Class - {EEE6C35D-6118-11DC-9C72-001320C79847} - C:\Programmi\SweetIM\Toolbars\Internet Explorer\mgHelper.dll
R3 - URLSearchHook: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn\yt.dll
O2 - BHO: &Yahoo! Toolbar Helper - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn\yt.dll
O2 - BHO: Supporto di collegamento per Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: Search Helper - {6EBF7485-159F-4bff-A14F-B9E3AAC4465B} - C:\Programmi\Microsoft\Search Enhancement Pack\Search Helper\SearchHelper.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: Windows Live Toolbar Helper - {E15A8DC0-8516-42A1-81EA-DC94EC1ACF10} - C:\Programmi\Windows Live\Toolbar\wltcore.dll
O2 - BHO: SWEETIE - {EEE6C35C-6118-11DC-9C72-001320C79847} - C:\Programmi\SweetIM\Toolbars\Internet Explorer\mgToolbarIE.dll
O2 - BHO: SingleInstance Class - {FDAD4DA1-61A2-4FD8-9C17-86F7AC245081} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn\YTSingleInstance.dll
O3 - Toolbar: SweetIM Toolbar for Internet Explorer - {EEE6C35B-6118-11DC-9C72-001320C79847} - C:\Programmi\SweetIM\Toolbars\Internet Explorer\mgToolbarIE.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\PROGRA~1\Yahoo!\Companion\Installs\cpn\yt.dll
O3 - Toolbar: &Windows Live Toolbar - {21FA44EF-376D-4D53-9B0F-8A89D3229068} - C:\Programmi\Windows Live\Toolbar\wltcore.dll
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Programmi\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Programmi\Analog Devices\SoundMAX\SMax4PNP.exe
O4 - HKLM\..\Run: [SoundMAX] "C:\Programmi\Analog Devices\SoundMAX\Smax4.exe" /tray
O4 - HKLM\..\Run: [TrueImageMonitor.exe] C:\Programmi\Acronis\TrueImageHome\TrueImageMonitor.exe
O4 - HKLM\..\Run: [AcronisTimounterMonitor] C:\Programmi\Acronis\TrueImageHome\TimounterMonitor.exe
O4 - HKLM\..\Run: [Acronis Scheduler2 Service] "C:\Programmi\File comuni\Acronis\Schedule2\schedhlp.exe"
O4 - HKLM\..\Run: [DU Meter] C:\Programmi\DU Meter\DUMeter.exe
O4 - HKLM\..\Run: [HP Software Update] C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [SweetIM] C:\Programmi\SweetIM\Messenger\SweetIM.exe
O4 - HKLM\..\Run: [RoxWatchTray] "C:\Programmi\File comuni\Roxio Shared\9.0\SharedCOM\RoxWatchTray9.exe"
O4 - HKLM\..\Run: [VX3000] C:\WINDOWS\vVX3000.exe
O4 - HKLM\..\Run: [LifeCam] "C:\Programmi\Microsoft LifeCam\LifeExp.exe"
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\RunOnce: [Malwarebytes' Anti-Malware] C:\Programmi\Malwarebytes' Anti-Malware\mbamgui.exe /install /silent
O4 - HKCU\..\Run: [MsnMsgr] ~"C:\Programmi\Windows Live\Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [ISUSPM] "C:\Documents and Settings\All Users\Dati applicazioni\Macrovision\FLEXnet Connect\6\ISUSPM.exe" -scheduler
O4 - HKUS\S-1-5-19\..\RunOnce: [nlsf] cmd.exe /C move /Y "%SystemRoot%\System32\syssetub.dll" "%SystemRoot%\System32\syssetup.dll" (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-19\..\RunOnce: [nlhr] RunDll32.exe %SystemRoot%\System32\AdvPack.Dll,LaunchINFSection %SystemRoot%\inf\nlite.inf,C (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-19\..\RunOnce: [tscuninstall] %systemroot%\system32\tscupgrd.exe (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\RunOnce: [nlsf] cmd.exe /C move /Y "%SystemRoot%\System32\syssetub.dll" "%SystemRoot%\System32\syssetup.dll" (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-18\..\RunOnce: [nlsf] cmd.exe /C move /Y "%SystemRoot%\System32\syssetub.dll" "%SystemRoot%\System32\syssetup.dll" (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\RunOnce: [nlsf] cmd.exe /C move /Y "%SystemRoot%\System32\syssetub.dll" "%SystemRoot%\System32\syssetup.dll" (User 'Default user')
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Programmi\HP\Digital Imaging\bin\hpqtra08.exe
O4 - Global Startup: WinZip Quick Pick.lnk = C:\Programmi\WinZip\WZQKPICK.EXE
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: 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: {20A60F0D-9AFA-4515-A0FD-83BD84642501} (Checkers Class) - http://messenger.zone.msn.com/binary/msgrchkr.cab56986.cab
O16 - DPF: {4F1E5B1A-2A80-42CA-8532-2D05CB959537} (MSN Photo Upload Tool) - http://gfx1.hotmail.com/mail/w3/resources/MSNPUpld.cab
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPAClient.cab56907.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{FECF0375-BCFB-40EF-8AB5-82BFD1F957D2}: NameServer = 62.13.171.1 62.13.171.2
O23 - Service: Acronis Scheduler2 Service (AcrSch2Svc) - Acronis - C:\Programmi\File comuni\Acronis\Schedule2\schedul2.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: Roxio UPnP Renderer 9 - Sonic Solutions - C:\Programmi\Roxio\Digital Home 9\RoxioUPnPRenderer9.exe
O23 - Service: Roxio Upnp Server 9 - Sonic Solutions - C:\Programmi\Roxio\Digital Home 9\RoxioUpnpService9.exe
O23 - Service: LiveShare P2P Server 9 (RoxLiveShare9) - Sonic Solutions - C:\Programmi\File comuni\Roxio Shared\9.0\SharedCOM\RoxLiveShare9.exe
O23 - Service: RoxMediaDB9 - Sonic Solutions - C:\Programmi\File comuni\Roxio Shared\9.0\SharedCOM\RoxMediaDB9.exe
O23 - Service: Roxio Hard Drive Watcher 9 (RoxWatch9) - Sonic Solutions - C:\Programmi\File comuni\Roxio Shared\9.0\SharedCOM\RoxWatch9.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
O23 - Service: Acronis Try And Decide Service (TryAndDecideService) - Unknown owner - C:\Programmi\File comuni\Acronis\Fomatik\TrueImageTryStartService.exe

--
End of file - 9490 bytes
e questo fatto con malware :
Malwarebytes' Anti-Malware 1.46
www.malwarebytes.org

Versione database: 4052

Windows 5.1.2600 Service Pack 2
Internet Explorer 8.0.6001.18702

09/05/2010 21.41.47
mbam-log-2010-05-09 (21-41-47).txt

Tipo di scansione: Scansione veloce
Elementi esaminati: 114532
Tempo trascorso: 6 minuti, 44 secondi

Processi infetti in memoria: 0
Moduli di memoria infetti: 0
Chiavi di registro infette: 2
Valori di registro infetti: 2
Voci infette nei dati di registro: 5
Cartelle infette: 0
File infetti: 1

Processi infetti in memoria:
(Non sono stati rilevati elementi nocivi)

Moduli di memoria infetti:
(Non sono stati rilevati elementi nocivi)

Chiavi di registro infette:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\{19127ad2-394b-70f5-c650-b97867baa1f7} (Backdoor.Bot) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\{43bf8cd1-c5d5-2230-7bb2-98f22c2b7dc6} (Backdoor.Bot) -> Quarantined and deleted successfully.

Valori di registro infetti:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Network\uid (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\forceclassiccontrolpanel (Hijack.ControlPanelStyle) -> Quarantined and deleted successfully.

Voci infette nei dati di registro:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Trojan.Downloader) -> Data: c:\windows\system32\userinit.exe -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Trojan.Downloader) -> Data: system32\userinit.exe -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\AntiVirusDisableNotify (Disabled.SecurityCenter) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\FirewallDisableNotify (Disabled.SecurityCenter) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\UpdatesDisableNotify (Disabled.SecurityCenter) -> Bad: (1) Good: (0) -> Quarantined and deleted successfully.

Cartelle infette:
(Non sono stati rilevati elementi nocivi)

File infetti:
C:\Documents and Settings\Administrator\Impostazioni locali\Temp\ie3.tmp (Trojan.Agent) -> Quarantined and deleted successfully.

Il mio consiglio è di fare una scansione COMPLETA con Malwarebytes, che peraltro è già installato nel tuo PC.

scansione completa
Malwarebytes' Anti-Malware 1.46
www.malwarebytes.org

Versione database: 4052

Windows 5.1.2600 Service Pack 2
Internet Explorer 8.0.6001.18702

15/05/2010 22.42.20
mbam-log-2010-05-15 (22-42-20).txt

Tipo di scansione: Scansione completa (C:\|D:\|)
Elementi esaminati: 151072
Tempo trascorso: 43 minuti, 52 secondi

Processi infetti in memoria: 0
Moduli di memoria infetti: 0
Chiavi di registro infette: 6
Valori di registro infetti: 1
Voci infette nei dati di registro: 5
Cartelle infette: 1
File infetti: 5

Processi infetti in memoria:
(Non sono stati rilevati elementi nocivi)

Moduli di memoria infetti:
(Non sono stati rilevati elementi nocivi)

Chiavi di registro infette:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\{19127ad2-394b-70f5-c650-b97867baa1f7} (Backdoor.Bot) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\{43bf8cd1-c5d5-2230-7bb2-98f22c2b7dc6} (Backdoor.Bot) -> Quarantined and deleted successfully.
HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\{19127ad2-394b-70f5-c650-b97867baa1f7} (Backdoor.Bot) -> Quarantined and deleted successfully.
HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\{43bf8cd1-c5d5-2230-7bb2-98f22c2b7dc6} (Backdoor.Bot) -> Quarantined and deleted successfully.
HKEY_USERS\S-1-5-18\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\{19127ad2-394b-70f5-c650-b97867baa1f7} (Backdoor.Bot) -> Quarantined and deleted successfully.
HKEY_USERS\S-1-5-18\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\{43bf8cd1-c5d5-2230-7bb2-98f22c2b7dc6} (Backdoor.Bot) -> Quarantined and deleted successfully.

Valori di registro infetti:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Network\uid (Malware.Trace) -> Quarantined and deleted successfully.

Voci infette nei dati di registro:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Trojan.Downloader) -> Data: c:\windows\system32\userinit.exe -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Trojan.Downloader) -> Data: system32\userinit.exe -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Spyware.Zbot) -> Data: c:\windows\system32\sdra64.exe -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Spyware.Zbot) -> Data: system32\sdra64.exe -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Hijack.Userinit) -> Bad: (C:\WINDOWS\system32\userinit.exe,C:\WINDOWS\system32\sdra64.exe,) Good: (Userinit.exe) -> Quarantined and deleted successfully.

Cartelle infette:
C:\WINDOWS\system32\lowsec (Stolen.data) -> Delete on reboot.

File infetti:
C:\WINDOWS\system32\lowsec\local.ds (Stolen.data) -> Delete on reboot.
C:\WINDOWS\system32\lowsec\user.ds (Stolen.data) -> Delete on reboot.
C:\Documents and Settings\Administrator\Impostazioni locali\Temp\in1A.tmp (Malware.Trace) -> Quarantined and deleted successfully.
C:\Documents and Settings\Administrator\Impostazioni locali\Temp\ie1B.tmp (Malware.Trace) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\sdra64.exe (Spyware.Zbot) -> Delete on reboot.

Mi sono espresso assai male, anzi non mi sono prorpio espresso.
Dopo aver scaricato e installato Malwarebytes devi subito AGGIORNARLO:
apri il programma e clicca su aggiornamento:
attendi che MBAM aggiorni le definizioni virali.
Esegui ora la scansione con Malwarebytes e posta qui il nuovo log.