Subito..

Logfile of HijackThis v1.99.1
Scan saved at 20.22.39, on 20/01/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

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\Explorer.EXE
C:\windows\system32\spoolsv.exe
C:\Programmi\TrojanHunter 5.0\THGuard.exe
C:\Programmi\File comuni\Scansoft Shared\SSBkgdUpdate\SSBkgdupdate.exe
C:\Programmi\QuickTime\bak\qttask.exe
C:\Programmi\AntiVir PersonalEdition Classic\sched.exe
C:\windows\System32\spool\DRIVERS\W32X86\3\E_S10IC2.EXE
C:\Programmi\AntiVir PersonalEdition Classic\avguard.exe
C:\windows\system32\rundll32.exe
C:\Programmi\AntiVir PersonalEdition Classic\avgnt.exe
C:\Programmi\Grisoft\AVG Anti-Spyware 7.5\avgas.exe
C:\Programmi\ClamWin\bin\ClamTray.exe
C:\Programmi\Grisoft\AVG Anti-Spyware 7.5\guard.exe
C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
C:\windows\system32\slserv.exe
C:\windows\system32\svchost.exe
C:\windows\system32\wuauclt.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Documents and Settings\Administrator\Desktop\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://gw.aliceadsl.it/home
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = ;127.0.0.1;<local>
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O4 - HKLM\..\Run: [THGuard] "C:\Programmi\TrojanHunter 5.0\THGuard.exe"
O4 - HKLM\..\Run: [SSBkgdUpdate] "C:\Programmi\File comuni\Scansoft Shared\SSBkgdUpdate\SSBkgdupdate.exe" -Embedding -boot
O4 - HKLM\..\Run: [SetDefPrt] C:\Programmi\Brother\Brmfl06a\BrStDvPt.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\bak\qttask.exe" -atboottime
O4 - HKLM\..\Run: [PaperPort PTD] C:\Programmi\ScanSoft\PaperPort\pptd40nt.exe
O4 - HKLM\..\Run: [IndexSearch] C:\Programmi\ScanSoft\PaperPort\IndexSearch.exe
O4 - HKLM\..\Run: [EPSON Stylus C42 Series] C:\windows\System32\spool\DRIVERS\W32X86\3\E_S10IC2.EXE /P23 "EPSON Stylus C42 Series" /O6 "USB001" /M "Stylus C42"
O4 - HKLM\..\Run: [ControlCenter3] C:\Programmi\Brother\ControlCenter3\brctrcen.exe /autorun
O4 - HKLM\..\Run: [CnxTrApp] rundll32.exe "C:\Programmi\Aethra\ADSL EB1070 USB\CnxTrApp.dll",AppEntry -REG "Aethra\ADSL EB1070 USB"
O4 - HKLM\..\Run: [BrMfcWnd] C:\Programmi\Brother\Brmfcmon\BrMfcWnd.exe /AUTORUN
O4 - HKLM\..\Run: [avgnt] "C:\Programmi\AntiVir PersonalEdition Classic\avgnt.exe" /min
O4 - HKLM\..\Run: [!AVG Anti-Spyware] "C:\Programmi\Grisoft\AVG Anti-Spyware 7.5\avgas.exe" /minimized
O4 - HKLM\..\Run: [ClamWin] "C:\Programmi\ClamWin\bin\ClamTray.exe" --logon
O4 - HKCU\..\Run: [updateMgr] "C:\Programmi\Adobe\Acrobat 7.0\Reader\AdobeUpdateManager.exe" AcRdB7_0_8 -reboot 1
O4 - HKCU\..\Run: [ctfmon.exe] C:\windows\system32\ctfmon.exe
O4 - Global Startup: Avvio veloce di Adobe Reader.lnk = C:\Programmi\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
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
O14 - IERESET.INF: START_PAGE_URL=http://gw.aliceadsl.it/home
O16 - DPF: {215B8138-A3CF-44C5-803F-8226143CFC0A} (Trend Micro ActiveX Scan Agent 6.6) - http://housecall65.trendmicro.com/housecall/applet/html/native/x86/win32/activex/hcImpl.cab
O16 - DPF: {2BC66F54-93A8-11D3-BEB6-00105AA9B6AE} (Symantec AntiVirus scanner) - http://security.symantec.com/sscv6/SharedContent/vc/bin/AvSniff.cab
O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://acs.pandasoftware.com/activescan/as5free/asinst.cab
O23 - Service: AntiVir PersonalEdition Classic Scheduler (AntiVirScheduler) - Avira GmbH - C:\Programmi\AntiVir PersonalEdition Classic\sched.exe
O23 - Service: AntiVir PersonalEdition Classic Guard (AntiVirService) - Avira GmbH - C:\Programmi\AntiVir PersonalEdition Classic\avguard.exe
O23 - Service: AVG Anti-Spyware Guard - GRISOFT s.r.o. - C:\Programmi\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: EPSON Printer Status Agent2 (EPSONStatusAgent2) - SEIKO EPSON CORPORATION - C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
O23 - Service: SmartLinkService (SLService) - Smart Link - C:\windows\SYSTEM32\slserv.exe

Ciao domy81.

Il log non presenta anomalie.

è molto probabile che sia un dialer,prova a fare una scansione on-line a questo indirizzo:

http://www.pandasoftware.com/activescan/it/activescan_principal.htm

oppure fai una scansione con il tuo antivirus in MODALITA PROVVISORIA come qui descritto:

http://guide.aiutamici.com/guide?C1=7&C2=68&ID=80122

piccolo aggiornamento...
Ho scansionato con antivir, on line, con adaware e di nuovo con trojanhunter e risulta tutto pulito ma...il probl rimane!
C'è un modo manuale per trovare ed eliminare questo dialer?!