Fai Start\Esegui \copia e incolla la stringa: control userpasswords2
Guarda se c'è un'utenza con nome a caso.
Se c'è,(speriamo di no) hai il LinkOptimizer.
Posta un log di HijackThis.

Per rispondere a rudewolf credo che la risposta sia si perchè il computer lo usa più mio figlio che io e si installano sempre nuovi programmi. Per quanto riguarda il consiglio di r16 dopo aver dato il comando esegui vengono segnalati 4 user cosi elencati: Administrator, Angelo (che sarei io), pLT (di cui non ho idea di chi sia) e tUcbmMtmkO e credo proprio di avere qualche ospite indesiderato. Mi dite per favore di che si tratta? Grazie.

Grazie P2. Non c'è nessun servizio con il nome delle utenze random da me trovate ho controllato come tu mi hai suggerito. Ti allego il log Hijackthis ciao:



Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 19.49.29, on 27/07/2008
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP3 (6.00.2900.5512)
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:\Programmi\PC Tools Firewall Plus\FWService.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\VTTimer.exe
C:\WINDOWS\system32\VTtrayp.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Programmi\Java\jre1.6.0_01\bin\jusched.exe
C:\WINDOWS\VM_STI.EXE
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\Programmi\D-Link\AirPlus G\AirGCFG.exe
C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe
C:\Programmi\ANI\ANIWZCS2 Service\WZCSLDR2.exe
C:\Programmi\PC Tools Firewall Plus\FirewallGUI.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\File comuni\Ahead\Lib\NMBgMonitor.exe
C:\Programmi\Lavasoft\Ad-Aware 2007\aawservice.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
C:\Programmi\MSN Messenger\usnsvc.exe
C:\Programmi\MSN Messenger\msnmsgr.exe
C:\Programmi\eMule\emule.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Trend Micro\HijackThis\HijackThis.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://it.yahoo.com/fsc/
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://red.clientapps.yahoo.com/customize/fuji/defaults/su/*http://www.yahoo.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\Programmi\Real\RealPlayer\rpbrowserrecordplugin.dll
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre1.6.0_01\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O3 - Toolbar: Easy-WebPrint - {327C2873-E90D-4c37-AA9D-10AC9BABA46C} - C:\Programmi\Canon\Easy-WebPrint\Toolband.dll
O4 - HKLM\..\Run: [VTTimer] VTTimer.exe
O4 - HKLM\..\Run: [VTTrayp] VTtrayp.exe
O4 - HKLM\..\Run: [PCSuiteTrayApplication] C:\PROGRA~1\Nokia\NOKIAP~1\LAUNCH~1.EXE -startup
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [PinnacleDriverCheck] C:\WINDOWS\system32\PSDrvCheck.exe -CheckReg
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre1.6.0_01\bin\jusched.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\Programmi\File comuni\Ahead\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [BigDogPath] C:\WINDOWS\VM_STI.EXE Vimicro USB PC Camera 305
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [D-Link AirPlus G] C:\Programmi\D-Link\AirPlus G\AirGCFG.exe
O4 - HKLM\..\Run: [ISUSPM Startup] C:\PROGRA~1\FILECO~1\INSTAL~1\UPDATE~1\isuspm.exe -startup
O4 - HKLM\..\Run: [ISUSScheduler] "C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe" -start
O4 - HKLM\..\Run: [ANIWZCS2Service] C:\Programmi\ANI\ANIWZCS2 Service\WZCSLDR2.exe
O4 - HKLM\..\Run: [00PCTFW] "C:\Programmi\PC Tools Firewall Plus\FirewallGUI.exe" -s
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Programmi\File comuni\Ahead\Lib\NMBgMonitor.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 - Startup: Adobe Gamma.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0_01\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0_01\bin\ssv.dll
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:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\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: {20A60F0D-9AFA-4515-A0FD-83BD84642501} (Checkers Class) - http://messenger.zone.msn.com/binary/msgrchkr.cab56986.cab
O16 - DPF: {2D8ED06D-3C30-438B-96AE-4D110FDC1FB8} (ActiveScan 2.0 Installer Class) - http://acs.pandasoftware.com/activescan/cabs/as2stubie.cab
O16 - DPF: {5D6F45B3-9043-443D-A792-115447494D24} (UnoCtrl Class) - http://messenger.zone.msn.com/IT-IT/a-UNO1/GAME_UNO1.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://www.update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1190374238421
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://acs.pandasoftware.com/activescan/as5free/asinst.cab
O16 - DPF: {BDBDE413-7B1C-4C68-A8FF-C5B2B4090876} (F-Secure Online Scanner 3.3) - http://support.f-secure.com/ols/fscax.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\..\{0E01C3B2-C5EF-4C27-811C-D0E7279E1F14}: NameServer = 192.168.1.1
O23 - Service: Ad-Aware 2007 Service (aawservice) - Lavasoft AB - C:\Programmi\Lavasoft\Ad-Aware 2007\aawservice.exe
O23 - Service: Adobe LM Service - Adobe Systems - C:\Programmi\File comuni\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: ANIWZCSd Service (ANIWZCSdService) - Wireless Service - C:\Programmi\ANI\ANIWZCS2 Service\ANIWZCSdS.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Programmi\Alwil Software\Avast4\aswUpdSv.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: PC Tools Firewall Plus (PCToolsFirewallPlus) - PC Tools - C:\Programmi\PC Tools Firewall Plus\FWService.exe
O23 - Service: ServiceLayer - Nokia. - C:\Programmi\File comuni\PCSuite\Services\ServiceLayer.exe
O24 - Desktop Component 0: (no name) - http://image.excite.it//spettacolo/foto/alba/23big.jpg

--
End of file - 7923 bytes

Ok tutto fatto come suggerito da P2 allego il lo di Virit che sembra aver trovato e rimosso qualche virus, fammi sapere, grazie. Ciao




VirIT eXplorer Lite Log

[SCANSIONE DELLA MEMORIA]
OK
[SCANSIONE DELLA MEMORIA]
OK

---

28/07/2008 - 00:14:47

[SCANSIONE DEL REGISTRO]
{2a6af021-17a2-4014-8624-cf6015f82fad} Infetto da BHO.Agent.BA
* * * RIMOSSO * * *
{f250d521-225d-4d6b-8829-e064f944e180} Infetto da BHO.Agent.BM
* * * RIMOSSO * * *

[C:]
MASTER BOOT RECORD: OK
BOOT SECTOR: OK


Chiavi Registro infette: 2.
Files Infetti: 0.
Files Sospetti: 0.
Files Analizzati: 2875.
Files Totali: 2875.
Chiavi Registro rimosse: 2.
Virus Rimossi: 0.

[SCANSIONE DELLA MEMORIA]
OK

---

28/07/2008 - 00:21:23

[SCANSIONE DEL REGISTRO]
OK

[C:]
MASTER BOOT RECORD: OK
BOOT SECTOR: OK


Chiavi Registro infette: 0.
Files Infetti: 0.
Files Sospetti: 0.
Files Analizzati: 2.
Files Totali: 2.
Chiavi Registro rimosse: 0.
Virus Rimossi: 0.

[SCANSIONE DELLA MEMORIA]
OK

---

28/07/2008 - 00:26:36

[SCANSIONE DEL REGISTRO]
OK

[C:]
MASTER BOOT RECORD: OK
BOOT SECTOR: OK


[D:]


[F:]
BOOT SECTOR: OK


[G:]
BOOT SECTOR: OK


[H:]
BOOT SECTOR: OK


[I:]
BOOT SECTOR: OK


[J:]
BOOT SECTOR: OK


Chiavi Registro infette: 0.
Files Infetti: 0.
Files Sospetti: 0.
Files Analizzati: 64532.
Files Totali: 64532.
Chiavi Registro rimosse: 0.
Virus Rimossi: 0.

---

28/07/2008 - 07:08:15

[SCANSIONE DEL REGISTRO]
OK

[C:]
MASTER BOOT RECORD: OK
BOOT SECTOR: OK


[D:]


[F:]
BOOT SECTOR: OK


[G:]
BOOT SECTOR: OK


[H:]
BOOT SECTOR: OK


[I:]
BOOT SECTOR: OK


[J:]
BOOT SECTOR: OK


Chiavi Registro infette: 0.
Files Infetti: 0.
Files Sospetti: 0.
Files Analizzati: 64532.
Files Totali: 64532.
Chiavi Registro rimosse: 0.
Virus Rimossi: 0.

[SCANSIONE DELLA MEMORIA]
OK

---

28/07/2008 - 09:32:34

[SCANSIONE DEL REGISTRO]
OK

[C:]
MASTER BOOT RECORD: OK
BOOT SECTOR: OK


Chiavi Registro infette: 0.
Files Infetti: 0.
Files Sospetti: 0.
Files Analizzati: 21.
Files Totali: 21.
Chiavi Registro rimosse: 0.
Virus Rimossi: 0.

[SCANSIONE DELLA MEMORIA]
OK

administrator administrator
aspnet users
giza administartor

con esegui ho trovato questi , sono regolari?

Grazie per l'aiuto P2. Un saluto.-