E' il mio primo post, quindi saluto tutti e vi prego di perdonare se farò degli errori nel postare.
La questione è questa:
Firefox mi apre dei popup pubblicitari benché sia tutto settato per bloccarli.
Anche peggio, questi popup sono "mirati".
Es. apro un articolo su "il fatto quotidiano" nel cui titolo c'è la parola "sesso" e si apre il popup di un sito a luci rosse.

Ho fatto il log con Hijiack, e lo allego qui sotto.
Ho un sistema a 64 bit, per cui non mi funziona combofix.
Malwarebyte non rileva problemi.
Installati:
Antivirus Avira
PC tools spyware doctor

Ringrazio in anticipo quelli che mi vorranno dare una mano.

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 10:25:18, on 27/02/2012
Platform: Windows 7 SP1 (WinNT 6.00.3505)
MSIE: Internet Explorer v8.00 (8.00.7601.17514)
Boot mode: Normal

Running processes:
C:\Program Files (x86)\Common Files\Ahead\Lib\NMBgMonitor.exe
C:\Program Files (x86)\Nokia\Nokia Ovi Suite\NokiaOviSuite.exe
C:\Program Files (x86)\Adobe\Reader 9.0\Reader\reader_sl.exe
C:\Program Files (x86)\Common Files\Nokia\MPlatform\NokiaMServer.exe
C:\Program Files (x86)\Real\RealPlayer\Update\realsched.exe
C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe
C:\Program Files (x86)\PC Tools\PC Tools Security\pctsGui.exe
C:\Program Files (x86)\Avira\AntiVir Desktop\avgnt.exe
C:\Users\Public\Documents\AppData\PoApp\PLauncher.exe
C:\Windows\Samsung\PanelMgr\SSMMgr.exe
C:\Program Files (x86)\Trend Micro\HiJackThis\HiJackThis.exe
C:\Program Files (x86)\Microsoft Office\OFFICE11\WINWORD.EXE
C:\Program Files (x86)\Common Files\Ahead\Lib\NMIndexStoreSvr.exe
C:\Program Files (x86)\PC Connectivity Solution\Transports\NclMSBTSrvEx.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.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://search.findeer.com
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\Windows\SysWOW64\blank.htm
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: PC Tools Browser Defender - {472734EA-242A-422b-ADF8-83D1E48CC825} - C:\Program Files (x86)\PC Tools\PC Tools Security\BDT\PCTBrowserDefender.dll
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files (x86)\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: Browser Defender BHO - {2A0F3D1B-0909-4FF4-B272-609CCE6054E7} - C:\Program Files (x86)\PC Tools\PC Tools Security\BDT\PCTBrowserDefender.dll
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\ProgramData\Real\RealPlayer\BrowserRecordPlugin\IE\rpbrowserrecordplugin.dll
O2 - BHO: QUICKfind BHO Object - {C08DF07A-3E49-4E25-9AB0-D3882835F153} - C:\PROGRA~2\IDM\QUICKF~1\PlugIns\IEHelp.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files (x86)\Java\jre6\bin\jp2ssv.dll
O3 - Toolbar: PC Tools Browser Defender - {472734EA-242A-422B-ADF8-83D1E48CC825} - C:\Program Files (x86)\PC Tools\PC Tools Security\BDT\PCTBrowserDefender.dll
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files (x86)\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files (x86)\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [Adobe ARM] "C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [NokiaMServer] C:\Program Files (x86)\Common Files\Nokia\MPlatform\NokiaMServer /watchfiles startup
O4 - HKLM\..\Run: [CTRegRun] C:\Windows\CTRegRun.EXE
O4 - HKLM\..\Run: [TkBellExe] "c:\program files (x86)\real\realplayer\Update\realsched.exe" -osboot
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [ISTray] "C:\Program Files (x86)\PC Tools\PC Tools Security\pctsGui.exe" /hideGUI
O4 - HKLM\..\Run: [avgnt] "C:\Program Files (x86)\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [PosService] C:\Users\Public\Documents\AppData\PoApp\PLauncher.exe
O4 - HKLM\..\Run: [Samsung PanelMgr] C:\Windows\Samsung\PanelMgr\ssmmgr.exe /autorun
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Program Files (x86)\Common Files\Ahead\Lib\NMBgMonitor.exe"
O4 - HKCU\..\Run: [NokiaOviSuite2] C:\Program Files (x86)\Nokia\Nokia Ovi Suite\NokiaOviSuite.exe -tray
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~2\MICROS~1\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~2\MICROS~1\OFFICE11\REFIEBAR.DLL
O16 - DPF: {60E33102-59F1-44DA-BA3D-494BB9A80514} (Iphona) - http://www.inps.it/Servizi/ParlaConNoi/VoipFiles/IPhona.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\..\{764E4BC4-D6AC-4B30-80D3-861138A9AB7E}: NameServer = 176.31.229.24,176.31.229.25
O17 - HKLM\System\CCS\Services\Tcpip\..\{846ee342-7039-11de-9d20-806e6f6e6963}: NameServer = 176.31.229.24,176.31.229.25
O17 - HKLM\System\CS1\Services\Tcpip\..\{764E4BC4-D6AC-4B30-80D3-861138A9AB7E}: NameServer = 176.31.229.24,176.31.229.25
O17 - HKLM\System\CS2\Services\Tcpip\..\{764E4BC4-D6AC-4B30-80D3-861138A9AB7E}: NameServer = 176.31.229.24,176.31.229.25
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing)
O23 - Service: AMD External Events Utility - Unknown owner - C:\Windows\system32\atiesrxx.exe (file missing)
O23 - Service: Avira Pianificatore (AntiVirSchedulerService) - Avira Operations GmbH & Co. KG - C:\Program Files (x86)\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira Realtime Protection (AntiVirService) - Avira Operations GmbH & Co. KG - C:\Program Files (x86)\Avira\AntiVir Desktop\avguard.exe
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files (x86)\Common Files\Apple\Mobile Device Support\AppleMobileDeviceService.exe
O23 - Service: Servizio Bonjour (Bonjour Service) - Apple Inc. - C:\Program Files (x86)\Bonjour\mDNSResponder.exe
O23 - Service: Browser Defender Update Service - Unknown owner - C:\Program Files (x86)\PC Tools\PC Tools Security\BDT\BDTUpdateService.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\Windows\System32\lsass.exe (file missing)
O23 - Service: EPSON V5 Service4(01) (EPSON_EB_RPCV4_01) - SEIKO EPSON CORPORATION - C:\ProgramData\EPSON\EPW!3 SSRP\E_S40STB.EXE
O23 - Service: EPSON V3 Service4(01) (EPSON_PM_RPCV4_01) - SEIKO EPSON CORPORATION - C:\ProgramData\EPSON\EPW!3 SSRP\E_S40RPB.EXE
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\Windows\system32\fxssvc.exe (file missing)
O23 - Service: FLEXnet Licensing Service - Macrovision Europe Ltd. - C:\Program Files (x86)\Common Files\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: Servizio di Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\Windows\System32\msdtc.exe (file missing)
O23 - Service: NBService - Nero AG - C:\Program Files (x86)\Nero\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: @%SystemRoot%\System32\netlogon.dll,-102 (Netlogon) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: NMIndexingService - Nero AG - C:\Program Files (x86)\Common Files\Ahead\Lib\NMIndexingService.exe
O23 - Service: Pos Service (PowerOffer Service) - Unknown owner - C:\Users\Admin\AppData\Local\PosService\Pos.exe (file missing)
O23 - Service: @%systemroot%\system32\psbase.dll,-300 (ProtectedStorage) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\Locator.exe,-2 (RpcLocator) - Unknown owner - C:\Windows\system32\locator.exe (file missing)
O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: SBSD Security Center Service (SBSDWSCService) - Safer Networking Ltd. - C:\Program Files (x86)\Spybot - Search & Destroy\SDWinSec.exe
O23 - Service: PC Tools Auxiliary Service (sdAuxService) - PC Tools - C:\Program Files (x86)\PC Tools\PC Tools Security\pctsAuxs.exe
O23 - Service: PC Tools Security Service (sdCoreService) - PC Tools - C:\Program Files (x86)\PC Tools\PC Tools Security\pctsSvc.exe
O23 - Service: ServiceLayer - Nokia - C:\Program Files (x86)\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: Serv Updater (ServUpdater) - Unknown owner - C:\Users\Admin\AppData\Local\ServUpdater\ServiceUpd.exe (file missing)
O23 - Service: @%SystemRoot%\system32\snmptrap.exe,-3 (SNMPTRAP) - Unknown owner - C:\Windows\System32\snmptrap.exe (file missing)
O23 - Service: @%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - C:\Windows\System32\spoolsv.exe (file missing)
O23 - Service: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - C:\Windows\system32\sppsvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\Windows\system32\UI0Detect.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vaultsvc.dll,-1003 (VaultSvc) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vds.exe,-100 (vds) - Unknown owner - C:\Windows\System32\vds.exe (file missing)
O23 - Service: @%systemroot%\system32\vssvc.exe,-102 (VSS) - Unknown owner - C:\Windows\system32\vssvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\Wat\WatUX.exe,-601 (WatAdminSvc) - Unknown owner - C:\Windows\system32\Wat\WatAdminSvc.exe (file missing)
O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - C:\Windows\system32\wbengine.exe (file missing)
O23 - Service: @%Systemroot%\system32\wbem\wmiapsrv.exe,-110 (wmiApSrv) - Unknown owner - C:\Windows\system32\wbem\WmiApSrv.exe (file missing)
O23 - Service: @%PROGRAMFILES%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - C:\Program Files (x86)\Windows Media Player\wmpnetwk.exe (file missing)

--
End of file - 10473 bytes

Avvia HJTH in modalità provvisoria, rifai la scansione e cancella la seguente riga (tasto Fix Checked):

---

R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://search.findeer.com

---

Riavvia il computer e riferisci se il problema è risolto.

---