Ha ragione nckx83
http://www.soft32.com/download_178539.html

Il tuo pc com'è corredato ? mi spiego:hai il cd di ripristino ,oppure cd del sistema operativo,cd dei driver ecc.

Grazie, ho risolto in questo modo...è stata una mia idea, ditemi se ho fatto bene:
sono andata in Qoobox/Quarantine/ e nella cartella zippata ho estratto il file nella cartella dei drivers in system32 (che ho sostituito quindi con quello danneggiato ma presente), ho riavviato e... magicamente è tornata la connessione....

...no, sembra tutto ok. Rimane solo quel problema che appena si avvia e compare il desktop si apre la cartella documenti senza nessun comando...ma non vorrei degenerare nuovamente la situazione, mi sa che me lo tengo così

Ecco il file di Hijack:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 14.04.29, on 05/02/2010
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
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:\WINDOWS\System32\svchost.exe
C:\Programmi\Ahead\InCD\InCDsrv.exe
C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\System32\DRIVERS\CDANTSRV.EXE
C:\Programmi\COMODO\Firewall\cmdagent.exe
C:\Programmi\Intel\Intel Application Accelerator\iaantmon.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\Programmi\File comuni\Symantec Shared\SNDSrvc.exe
C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
C:\WINDOWS\system32\UTSCSI.EXE
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\wscntfy.exe
C:\Programmi\Intel\Intel Application Accelerator\iaanotif.exe
C:\Programmi\Analog Devices\SoundMAX\SMax4PNP.exe
C:\Programmi\Analog Devices\SoundMAX\Smax4.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\Programmi\Hewlett-Packard\Toolbox\StatusClient\StatusClient.exe
C:\Programmi\Hewlett-Packard\HP Software Update\HPWuSchd2.exe
C:\Programmi\Ahead\InCD\InCD.exe
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\Programmi\Mindjet\MindManager 6\MMReminderService.exe
C:\Programmi\COMODO\Firewall\cfp.exe
C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATIAKE.EXE
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Hewlett-Packard\Toolbox\jre\bin\javaw.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Tracker Software\PDF-XChange 3\pdfSaver\pdfSaver3.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Programmi\InterVideo\Common\Bin\WinCinemaMgr.exe
C:\Programmi\WinZip\WZQKPICK.EXE
C:\Programmi\Adobe\Acrobat 7.0\Reader\AcroRd32.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\Trend Micro\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
F2 - REG:system.ini: UserInit=c:\windows\system32\userinit.exe,userinit.exe
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: CmjBrowserHelperObject Object - {AC41D38F-B56D-40AD-94E0-B493D130C959} - C:\Programmi\Mindjet\MindManager 6\Mm6InternetExplorer.dll
O2 - BHO: (no name) - {BDF3E430-B101-42AD-A544-FADC6B084872} - (no file)
O2 - BHO: PDFCreator Toolbar Helper - {C451C08A-EC37-45DF-AAAD-18B51AB5E837} - C:\Programmi\PDFCreator Toolbar\v3.0.0.0\PDFCreator_Toolbar.dll
O2 - BHO: (no name) - {D1B60A35-CC7E-D197-7BAE-9A0CD05C324F} - (no file)
O3 - Toolbar: Virgilio Toolbar - {D3403F28-7D39-435F-A8CB-45016C29E48E} - C:\Programmi\Virgilio Toolbar\VirgilioBand.dll
O3 - Toolbar: (no name) - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - (no file)
O3 - Toolbar: (no name) - {0FFE2F08-3AC9-4A91-A61D-4FF24F91A561} - (no file)
O3 - Toolbar: PDFCreator Toolbar - {31CF9EBE-5755-4A1D-AC25-2834D952D9B4} - C:\Programmi\PDFCreator Toolbar\v3.0.0.0\PDFCreator_Toolbar.dll
O4 - HKLM\..\Run: [IAAnotif] C:\Programmi\Intel\Intel Application Accelerator\iaanotif.exe
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Programmi\Analog Devices\SoundMAX\SMax4PNP.exe
O4 - HKLM\..\Run: [SoundMAX] "C:\Programmi\Analog Devices\SoundMAX\Smax4.exe" /tray
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\System32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [StatusClient 2.6] C:\Programmi\Hewlett-Packard\Toolbox\StatusClient\StatusClient.exe /auto
O4 - HKLM\..\Run: [TomcatStartup 2.5] C:\Programmi\Hewlett-Packard\Toolbox\hpbpsttp.exe
O4 - HKLM\..\Run: [HP Software Update] "C:\Programmi\Hewlett-Packard\HP Software Update\HPWuSchd2.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [InCD] C:\Programmi\Ahead\InCD\InCD.exe
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe /Consumer
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [MMReminderService] C:\Programmi\Mindjet\MindManager 6\MMReminderService.exe
O4 - HKLM\..\Run: [COMODO Firewall Pro] "C:\Programmi\COMODO\Firewall\cfp.exe" -s
O4 - HKLM\..\Run: [EPSON PictureMate 100] C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATIAKE.EXE /P21 "EPSON PictureMate 100" /O6 "USB001" /M "PictureMate 100"
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [pdfSaver3] "C:\Programmi\Tracker Software\PDF-XChange 3\pdfSaver\pdfSaver3.exe"
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 - Global Startup: Adobe Gamma Loader.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Avvio veloce di Adobe Reader.lnk = C:\Programmi\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: InterVideo WinCinema Manager.lnk = C:\Programmi\InterVideo\Common\Bin\WinCinemaMgr.exe
O4 - Global Startup: WinZip Quick Pick.lnk = C:\Programmi\WinZip\WZQKPICK.EXE
O8 - Extra context menu item: &Search - http://bar.mywebsearch.com/menusearch.html?p=ZNxdm414YYIT
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: Send to Mindjet MindManager - {531B9DC0-D8EE-4c76-A6EE-6C1E50569655} - C:\Programmi\Mindjet\MindManager 6\Mm6InternetExplorer.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
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
O10 - Unknown file in Winsock LSP: c:\windows\system32\nwprovau.dll
O12 - Plugin for .spop: C:\Programmi\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: {1F831FA9-42FC-11D4-95A6-0080AD30DCE1} (InstaFred) - file://C:\Programmi\AutoCAD 2002 Ita\InstFred.ocx
O16 - DPF: {4F1E5B1A-2A80-42CA-8532-2D05CB959537} (MSN Photo Upload Tool) - http://by115fd.bay115.hotmail.msn.com/resources/MsnPUpld.cab
O16 - DPF: {56336BCB-3D8A-11D6-A00B-0050DA18DE71} - http://software-dl.real.com/20557eac23104ac71805/netzip/RdxIE601_it.cab
O16 - DPF: {78AF2F24-A9C3-11D3-BF8C-0060B0FCC122} (Controllo AcDc oggi) - file://C:\Programmi\AutoCAD 2002 Ita\AcDcToday.ocx
O16 - DPF: {8EC18CE2-D7B4-11D2-88C8-006008A717FD} (NCSView Class) - http://ww3.pcn.minambiente.it/ecwplugins/ncs.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://acs.pandasoftware.com/activescan/as5free/asinst.cab
O16 - DPF: {AE563729-B4F5-11D4-A415-00108302FDFD} (NOXLATE-BANR) - file://C:\Programmi\AutoCAD 2002 Ita\InstBanr.ocx
O16 - DPF: {DE625294-70E6-45ED-B895-CFFA13AEB044} (AxisMediaControlEmb Class) - http://88.41.58.162/activex/AMC.cab
O16 - DPF: {F281A59C-7B65-11D3-8617-0010830243BD} (Controllo AcPreview) - file://C:\Programmi\AutoCAD 2002 Ita\AcPreview.ocx
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: C-DillaSrv - C-Dilla Ltd - C:\WINDOWS\System32\DRIVERS\CDANTSRV.EXE
O23 - Service: COMODO Firewall Pro Helper Service (cmdAgent) - COMODO - C:\Programmi\COMODO\Firewall\cmdagent.exe
O23 - Service: IAA Event Monitor (IAANTMon) - Intel - C:\Programmi\Intel\Intel Application Accelerator\iaantmon.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: InCD Helper (InCDsrv) - Ahead Software AG - C:\Programmi\Ahead\InCD\InCDsrv.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\System32\HPZipm12.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\SNDSrvc.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
O23 - Service: CLCV0 (UTSCSI) - Unknown owner - C:\WINDOWS\system32\UTSCSI.EXE

--
End of file - 9333 bytes

Ciao bachla .
Installa il service pack3 di Windows XP :
http://www.microsoft.com/downloads/details.aspx?FamilyID=5b33b5a8-5e76-401f-be08-1e1555d4f3d4&DisplayLang=it

Installa Internet Explorer 8
http://www.microsoft.com/downloads/details.aspx?FamilyID=341c2ad5-8c3d-4347-8c03-08cdecd8852b&displaylang=it
Oppure IE7:
http://www.microsoft.com/downloads/details.aspx?FamilyID=9ae91ebe-3385-447c-8a30-081805b2f90b&DisplayLang=it

Alla fine riposta un log di HJT.