Nulla di grave o particolarmente fastidioso, ma non riesco a togliere come pagina iniziale di Firefox la seguente pagina che avrò installato inconsapevolmente con qualche programma:

http://www.search.ask.com/?l=dis&o=APN10749&gct=hp&apn_ptnrs=^AUC&apn_dtid=^YYYYYY^YY^IT&p2=^AUC^YYYYYY^YY^IT&tpid=KMPV6&apn_dbr=ff_21.0&apn_uid=C85067E3-12D4-426B-879F-E818112B7173&itbv=11.10.1.937&doi=2013-06-30

Vado nelle ozioni di Firefox, cambio la pagina, ma ad ogni avvio si ripresenta al pagina di cui sopra.

Ad ogni buon fine, magari per eliminare il superfluo che non ho installato con intenzione, allego i report di Malwarebytes Anti-Malware e HijackThis
Grazie, Giovanni.

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 17:15:49, on 01/07/2013
Platform: Unknown Windows (WinNT 6.01.3505 SP1)
MSIE: Internet Explorer v10.0 (10.00.9200.16611)
Boot mode: Normal

Running processes:
C:\Windows\system32\Dwm.exe
C:\Windows\system32\taskeng.exe
C:\Windows\system32\taskhost.exe
C:\Windows\Explorer.EXE
C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe
C:\Program Files\ATI Technologies\AMDUSB3DeviceDetector\nusb3mon.exe
C:\Program Files\Realtek\Audio\HDA\RtkNGUI.exe
C:\Program Files\Common Files\InstallShield\UpdateService\issch.exe
C:\Program Files\Avira\AntiVir Desktop\avgnt.exe
C:\Program Files\PDF24\pdf24.exe
C:\Program Files\AskPartnerNetwork\Toolbar\Updater\TBNotifier.exe
C:\Program Files\AMD Quick Stream\AppexAcceleratorUI.exe
C:\Program Files\Windows Sidebar\sidebar.exe
C:\Program Files\OpenOffice.org 3\program\soffice.exe
C:\Program Files\OpenOffice.org 3\program\soffice.bin
C:\Program Files\uTorrent\uTorrent.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Windows\system32\SearchProtocolHost.exe
C:\Windows\system32\SearchFilterHost.exe
F:\a Programmi utilizzati\HijackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.search.ask.com/?l=dis&o=APN10749&gct=hp&apn_ptnrs=^AUC&apn_dtid=^YYYYYY^YY^IT&p2=^AUC^YYYYYY^YY^IT&tpid=KMPV6&apn_dbr=ff_21.0&apn_uid=C85067E3-12D4-426B-879F-E818112B7173&itbv=11.10.1.937&doi=2013-06-30
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/p/?LinkId=255141
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/p/?LinkId=255141
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: SearchHook Class - {D8278076-BC68-4484-9233-6E7F1628B56C} - "C:\Program Files\AskPartnerNetwork\Toolbar\searchhook.dll" (file missing)
O2 - BHO: CrossriderApp0012765 - {11111111-1111-1111-1111-110111271165} - C:\Program Files\Savings Wave\Savings Wave-bho.dll
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: LyricsContainer - {463B0ED4-8AFA-404B-90E7-4063A0708050} - C:\Program Files\LyricsContainer\116.dll
O2 - BHO: KMP Media Toolbar BHO - {4B4D5056-3600-A76A-76A7-7A786E7484D7} - "C:\Program Files\AskPartnerNetwork\Toolbar\KMPV6\Passport.dll" (file missing)
O2 - BHO: Sing Along - {6492E171-2427-4932-B414-33574A089F5E} - C:\Program Files\SingAlong\singalng.dll
O2 - BHO: Windows Live ID Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre7\bin\jp2ssv.dll
O3 - Toolbar: KMP Media Toolbar - {4B4D5056-3600-A76A-76A7-7A786E7484D7} - "C:\Program Files\AskPartnerNetwork\Toolbar\KMPV6\Passport.dll" (file missing)
O4 - HKLM\..\Run: [AMD AVT] Cmd.exe /c start "AMD Accelerated Video Transcoding device initialization" /min "C:\Program Files\AMD AVT\bin\kdbsync.exe" aml
O4 - HKLM\..\Run: [StartCCC] "C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe" MSRun
O4 - HKLM\..\Run: [NUSB3MON] "C:\Program Files\ATI Technologies\AMDUSB3DeviceDetector\nusb3mon.exe"
O4 - HKLM\..\Run: [RTHDVCPL] C:\Program Files\Realtek\Audio\HDA\RtkNGUI.exe -s
O4 - HKLM\..\Run: [ISUSScheduler] "C:\Program Files\Common Files\InstallShield\UpdateService\issch.exe" -start
O4 - HKLM\..\Run: [BrowserPlugInHelper] C:\Program Files\Aimersoft\Video Converter Ultimate\BrowserPlugInHelper.exe
O4 - HKLM\..\Run: [avgnt] "C:\Program Files\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [PDFPrint] C:\Program Files\PDF24\pdf24.exe
O4 - HKLM\..\Run: [ApnTBMon] "C:\Program Files\AskPartnerNetwork\Toolbar\Updater\TBNotifier.exe"
O4 - HKCU\..\Run: [AppEx Accelerator UI] C:\Program Files\AMD Quick Stream\AppexAcceleratorUI.exe -h
O4 - HKCU\..\Run: [OpAgent] "OpAgent.exe" /agent
O4 - HKCU\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O4 - HKCU\..\Run: [Bubble Dock] "C:\Users\Tasca Pane\AppData\Roaming\Nosibay\Bubble Dock\LBubble Dock.exe" /winstartup
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-19\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-20\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVIZIO DI RETE')
O4 - Startup: OpenOffice.org 3.4.1.lnk = C:\Program Files\OpenOffice.org 3\program\quickstart.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Bonjour - {7F9DB11C-E358-4ca6-A83D-ACC663939424} - C:\Program Files\Bonjour\ExplorerPlugin.dll
O10 - Unknown file in Winsock LSP: c:\program files\common files\microsoft shared\windows live\wlidnsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\common files\microsoft shared\windows live\wlidnsp.dll
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O13 - Gopher Prefix:
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\..\{A09F903F-7B42-4F16-9B5B-5F0699F6B1B2}: NameServer = 8.8.8.8,8.8.4.4
O17 - HKLM\System\CS1\Services\Tcpip\..\{A09F903F-7B42-4F16-9B5B-5F0699F6B1B2}: NameServer = 8.8.8.8,8.8.4.4
O17 - HKLM\System\CS2\Services\Tcpip\..\{A09F903F-7B42-4F16-9B5B-5F0699F6B1B2}: NameServer = 8.8.8.8,8.8.4.4
O23 - Service: Adobe Acrobat Update Service (AdobeARMservice) - Adobe Systems Incorporated - C:\Program Files\Common Files\Adobe\ARM\1.0\armsvc.exe
O23 - Service: Adobe Flash Player Update Service (AdobeFlashPlayerUpdateSvc) - Adobe Systems Incorporated - C:\Windows\system32\Macromed\Flash\FlashPlayerUpdateService.exe
O23 - Service: AMD External Events Utility - AMD - C:\Windows\system32\atiesrxx.exe
O23 - Service: AMD FUEL Service - Advanced Micro Devices, Inc. - C:\Program Files\ATI Technologies\ATI.ACE\Fuel\Fuel.Service.exe
O23 - Service: Avira Pianificatore (AntiVirSchedulerService) - Avira Operations GmbH & Co. KG - C:\Program Files\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira Real-Time Protection (AntiVirService) - Avira Operations GmbH & Co. KG - C:\Program Files\Avira\AntiVir Desktop\avguard.exe
O23 - Service: Servizio di aggiornamento Ask (APNMCP) - APN LLC. - C:\Program Files\AskPartnerNetwork\Toolbar\apnmcp.exe
O23 - Service: Bonjour Service - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: FABS - Helping agent for MAGIX media database (Fabs) - MAGIX AG - C:\Program Files\Common Files\MAGIX Services\Database\bin\FABS.exe
O23 - Service: Firebird Server - MAGIX Instance (FirebirdServerMAGIXInstance) - MAGIX® - C:\Program Files\Common Files\MAGIX Services\Database\bin\fbserver.exe
O23 - Service: Servizio Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - C:\Program Files\Mozilla Maintenance Service\maintenanceservice.exe
O23 - Service: @C:\Program Files\Nero\Update\NASvc.exe,-200 (NAUpdate) - Nero AG - C:\Program Files\Nero\Update\NASvc.exe
O23 - Service: PandoraService (PanService) - Pandora.TV - C:\Program Files\PANDORA.TV\PanService\PandoraService.exe
O23 - Service: SolidConverterPDFReadSpool (SCPDFReadSpool) - Solid Documents, LLC - C:\Windows\Installer\MSI30B3.tmp

--
End of file - 8566 bytes



Malwarebytes Anti-Malware 1.75.0.1300
www.malwarebytes.org

Versione database: v2013.06.30.07

Windows 7 Service Pack 1 x86 NTFS
Internet Explorer 10.0.9200.16618
Tasca Pane :: TASCAPANE-PC [amministratore]

01/07/2013 17:16:18
MBAM-log-2013-07-01 (20-00-44).txt

Tipo di scansione: Scansione completa (C:\|)
Opzioni di scansione attive: Memoria | Esecuzione automatica | Registro | File di sistema | Euristica/Extra | Euristica/Shuriken | PUP | PUM
Opzioni di scansione disattivate: P2P
Elementi esaminati: 294700
Tempo impiegato: 52 minuti, 32 secondi

Processi rilevati in memoria: 0
(non sono stati rilevati elementi nocivi)

Moduli di memoria rilevati: 0
(non sono stati rilevati elementi nocivi)

Chiavi di registro rilevate: 6
HKCR\CLSID\{67BD9EEB-AA06-4329-A940-D250019300C9} (PUP.Software.Updater) -> Nessuna azione intrapresa.
HKCR\TypeLib\{A0EE0278-2986-4E5A-884E-A3BF0357E476} (PUP.Software.Updater) -> Nessuna azione intrapresa.
HKCR\Interface\{9EDC0C90-2B5B-4512-953E-35767BAD5C67} (PUP.Software.Updater) -> Nessuna azione intrapresa.
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{99C91FC5-DB5B-4AA0-BB70-5D89C5A4DF96} (PUP.Software.Updater) -> Nessuna azione intrapresa.
HKCR\Updater.AmiUpd.1 (PUP.Software.Updater) -> Nessuna azione intrapresa.
HKCR\Updater.AmiUpd (PUP.Software.Updater) -> Nessuna azione intrapresa.

Valori di registro rilevati: 0
(non sono stati rilevati elementi nocivi)

Voci rilevate nei dati di registro: 0
(non sono stati rilevati elementi nocivi)

Cartelle rilevate: 0
(non sono stati rilevati elementi nocivi)

File rilevati: 2
C:\Users\Tasca Pane\AppData\Local\SwvUpdater\Updater.exe (PUP.Software.Updater) -> Nessuna azione intrapresa.
C:\Windows\Tasks\AmiUpdXp.job (PUP.Software.Updater) -> Nessuna azione intrapresa.

Scarica Adwcleaner sul desktop:
http://general-changelog-team.fr/fr/downloads/finish/20-outils-de-xplode/2-adwcleaner
Clicca sul pulsante "Elimina".
Conferma con OK le varie finestre che ti compariranno.
Il pc si riavvierà, e uscirà il log con le eliminazioni.
Postalo qui.

Per postare il log:
Collegati ad internet e vai alla pagina WikiSend:
http://www.wikisend.com/
Clicca sul bottone "Sfoglia"
Seleziona il file appena salvato
Clicca su Upload file
Dopo qualche secondo, vieni spostato su una nuova pagina con il link in diversi formati:
Download Link / Forum Link
Seleziona Forum Link, copialo e incollalo in un nuovo messaggio per il forum.

Sì hai fatto bene.
Adwcleaner ha fatto un buon lavoro.
Ancora problemi?

Di niente.
Ciao.