Sui siti dove viene richiesto lgin e password viene visualizzato il messaggio di cui sopra. Ho ripristino le impostazioni di internet a predefinite per tutte le aree, ma nulla.
Vi posto il log
Logfile of HijackThis v1.99.1
Scan saved at 9.30.28, on 25/06/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16674)

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:\WINDOWS\System32\svchost.exe
C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\CA\SharedComponents\CA_LIC\lic98rmt.exe
C:\Programmi\File comuni\LightScribe\LSSrvc.exe
C:\Programmi\CA\SharedComponents\CA_LIC\LogWatNT.exe
C:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\Programmi\Java\jre1.6.0_06\bin\jusched.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Messenger\msmsgs.exe
C:\WABAL\wexa.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Documents and Settings\Proprietario\Desktop\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.corriere.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
R3 - URLSearchHook: Yahoo! Toolbar con blocco Pop-Up - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - (no file)
O2 - BHO: (no name) - {093AE555-89D0-4793-B427-4F471185C22B} - (no file)
O2 - BHO: (no name) - {30BEDFC8-3BFF-4AF8-BF23-89DECAD769AD} - C:\WINDOWS\system32\cbXRJARk.dll
O2 - BHO: (no name) - {3705F999-3D1E-4EF7-945D-61841D275C61} - C:\WINDOWS\system32\awttTlIc.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre1.6.0_06\bin\ssv.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\programmi\google\googletoolbar1.dll
O2 - BHO: {a2d403eb-450c-4598-ae74-ae4c5932aaab} - {baaa2395-c4ea-47ea-8954-c054be304d2a} - C:\WINDOWS\system32\trjjqanw.dll
O2 - BHO: (no name) - {C5A28212-A58F-47D3-AAC3-276AFA7CBB98} - (no file)
O2 - BHO: (no name) - {D37BA0C9-30D1-4485-8250-C269F863D5C1} - (no file)
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\programmi\google\googletoolbar1.dll
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [NeroFilterCheck] C:\Programmi\File comuni\Ahead\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre1.6.0_06\bin\jusched.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Programmi\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [BM2f191c12] Rundll32.exe "C:\WINDOWS\system32\obsuvfii.dll",s
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [ISUSScheduler] "C:\Programmi\File comuni\InstallShield\UpdateService\issch.exe" -start
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_06\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0_06\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) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
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
O11 - Options group: [INTERNATIONAL] International*
O12 - Plugin for .spop: C:\Programmi\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (YInstStarter Class) - C:\Programmi\Yahoo!\Common\yinsthelper.dll
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1213696681812
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://www.update.microsoft.com/microsoftupdate/v6/V5Controls/en/x86/client/muweb_site.cab?1213689906171
O16 - DPF: {8AD9C840-044E-11D1-B3E9-00805F499D93} (Java Runtime Environment 1.6.0) - http://sdlc-esd.sun.com/ESD42/JSCDL/jre/6u6-b90/jinstall-6u6-windows-i586-jc.cab?AuthParam=1211539511_e88f143798f1c03b17adf36430bf1e48&GroupName=JSC&BHost=javadl.sun.com&FilePath=/ESD42/JSCDL/jre/6u6-b90/jinstall-6u6-windows-i586-jc.cab&File=jinstall-6u6-windows-i586-jc.cab
O16 - DPF: {96B7D112-6E33-4D4A-823C-E57B00182490} (ARWebX Control) - http://213.217.168.8/ARWebX.cab
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\..\{ACEE6B9E-2EF7-4E4B-8ADE-9A6CF6559DF2}: NameServer = 151.99.125.2,151.99.125.3
O20 - AppInit_DLLs: trjjqanw.dll
O20 - Winlogon Notify: cbXRJARk - C:\WINDOWS\SYSTEM32\cbXRJARk.dll
O20 - Winlogon Notify: nnnmkLDs - nnnmkLDs.dll (file missing)
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
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: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: avast! Antivirus - ALWIL Software - C:\Programmi\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: CA License Client (CA_LIC_CLNT) - Computer Associates International Inc. - C:\Programmi\CA\SharedComponents\CA_LIC\lic98rmt.exe
O23 - Service: CA License Server (CA_LIC_SRVR) - Computer Associates International Inc. - C:\Programmi\CA\SharedComponents\CA_LIC\lic98rmtd.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\1150\Intel 32\IDriverT.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - C:\Programmi\File comuni\LightScribe\LSSrvc.exe
O23 - Service: Event Log Watch (LogWatch) - Computer Associates - C:\Programmi\CA\SharedComponents\CA_LIC\LogWatNT.exe
O23 - Service: NBService - Nero AG - C:\Programmi\Nero\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: NMIndexingService - Nero AG - C:\Programmi\File comuni\Ahead\Lib\NMIndexingService.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

Grazie

Ciao,
Chiudi HijackThis in una cartella a lui dedicata (possibilmente non sul desktop), altrimenti perdi i backup;

Disattiva il Ripristino configurazione di Sistema come qui descritto:

avvia in modalità provvisoria come qui descritto:

rendi visibili le cartelle nascoste ------ > procedura:
da Risorse del computer:
Strumenti >> Opzioni cartella >> visualizzazione;
metti la spunta su:
Visualizza file e cartelle nascoste;
togli la spunta da:
Nascondi file protetti del sistema(consigliato)


Avvia hijackthis, con tutte le applicazioni chiuse, premi su Do a system scan only , spunta ed elimina (fix checked) le seguenti righe:

---

O2 - BHO: (no name) - {093AE555-89D0-4793-B427-4F471185C22B} - (no file)
O2 - BHO: (no name) - {30BEDFC8-3BFF-4AF8-BF23-89DECAD769AD} - C:\WINDOWS\system32\cbXRJARk.dll
O2 - BHO: {a2d403eb-450c-4598-ae74-ae4c5932aaab} - {baaa2395-c4ea-47ea-8954-c054be304d2a} - C:\WINDOWS\system32\trjjqanw.dll
O2 - BHO: (no name) - {C5A28212-A58F-47D3-AAC3-276AFA7CBB98} - (no file)
O2 - BHO: (no name) - {D37BA0C9-30D1-4485-8250-C269F863D5C1} - (no file)
O4 - HKLM\..\Run: [BM2f191c12] Rundll32.exe "C:\WINDOWS\system32\obsuvfii.dll",s
O16 - DPF: {96B7D112-6E33-4D4A-823C-E57B00182490} (ARWebX Control) - http://213.217.168.8/ARWebX.cab
O20 - AppInit_DLLs: trjjqanw.dll
O20 - Winlogon Notify: cbXRJARk - C:\WINDOWS\SYSTEM32\cbXRJARk.dll

---

Trova e cancella il file in rosso:
___________________________________________

C:\WINDOWS\system32\\cbXRJARk.dll
C:\WINDOWS\system32\[trjjqanw.dll
___________________________________________

cancella i file temporanei del tuo profilo in questo modo:
Start >> Esegui. Scrivi (o copia e incolla) la stringa %temp%, clicca su Ok, così facendo accedi alla cartella temp;

Vai su Strumenti >> Opzioni Internet, elimina la cronologia, i files temporanei internet, i cookies;

svuota il cestino;

riavvia il computer normalmente.
Fai una scansione antivirus on line a questo indirizzo.

Alla fine:

rinascondi le cartelle di sistema;
riattiva il ripristino configurazione di sistema e, se tutto è a posto, creane uno nuovo.

---