Que tal MClaud, he hecho lo que me indicas y no cambió en nada.
De hecho deshabilité desde el primer día de uso las casillas de inicio, dejando únicamente el antivirus (McAfee) y utilizo regularmente el CCleaner para eliminar los archivos temporales, pero nada.
Mr_X, aqui copio el log:Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 03:57:37 p.m., on 27/07/2012
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\WLTRYSVC.EXE
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\System32\bcmwltry.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Cisco Systems\VPN Client\cvpnd.exe
C:\Program Files\McAfee\SiteAdvisor Enterprise\McSACore.exe
C:\Program Files\McAfee\Common Framework\FrameworkService.exe
C:\WINDOWS\system32\mfevtps.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\SigmaTel\C-Major Audio\WDM\StacSV.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Common Files\McAfee\SystemCore\mcshield.exe
C:\WINDOWS\system32\wuauclt.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\WLTRAY.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Documents and Settings\sonia.perez\Desktop\HiJackThis\HijackThis.exe
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL =
http://go.microsoft.com/fwlink/?LinkId=69157R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL =
http://go.microsoft.com/fwlink/?LinkId=54896R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page =
http://go.microsoft.com/fwlink/?LinkId=54896R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page =
http://go.microsoft.com/fwlink/?LinkId=69157R3 - URLSearchHook: McAfee SiteAdvisor Toolbar - {0EBBBE48-BAD4-4B4C-8E5A-516ABECAE064} - C:\Program Files\McAfee\SiteAdvisor Enterprise\McIEPlg.dll
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: Groove GFS Browser Helper - {72853161-30C5-4D22-B7F9-0BBC1D38A37E} - C:\Program Files\Microsoft Office\Office12\GrooveShellExtensions.dll
O2 - BHO: scriptproxy - {7DB2D5A0-7241-4E79-B68D-6309F01C5231} - C:\Program Files\Common Files\McAfee\SystemCore\ScriptSn.20120529120345.dll
O2 - BHO: Windows Live Aplicación auxiliar de inicio de sesión - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: McAfee SiteAdvisor BHO - {B164E929-A1B6-4A06-B104-2CD0E90A88FF} - C:\Program Files\McAfee\SiteAdvisor Enterprise\McIEPlg.dll
O3 - Toolbar: McAfee SiteAdvisor Toolbar - {0EBBBE48-BAD4-4B4C-8E5A-516ABECAE064} - C:\Program Files\McAfee\SiteAdvisor Enterprise\McIEPlg.dll
O4 - HKLM\..\Run: [Broadcom Wireless Manager UI] C:\WINDOWS\system32\WLTRAY.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Policies\Explorer\Run: [1] regedit32 /s \\dcmxsonda02\users\protector\desktopRutasmypics.reg
O8 - Extra context menu item: E&xportar a Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O9 - Extra button: Enviar a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: &Enviar a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) -
http://www.update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1341437620546O16 - DPF: {82774781-8F4E-11D1-AB1C-0000F8773BF0} (DLC Class) -
https://transfers.ds.microsoft.com/FTM/TransferSource/grTransferCtrl.cabO16 - DPF: {E06E2E99-0AA1-11D4-ABA6-0060082AA75C} (GpcContainer Class) -
https://akamaicdn.webex.com/client/WBXclient-T27L10NSP32EP5-14362/webex/ieatgpc.cabO17 - HKLM\System\CCS\Services\Tcpip\Parameters: Domain = mxsonda.com
O17 - HKLM\Software\..\Telephony: DomainName = mxsonda.com
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: Domain = mxsonda.com
O18 - Protocol: dssrequest - {5513F07E-936B-4E52-9B00-067394E91CC5} - C:\Program Files\McAfee\SiteAdvisor Enterprise\McIEPlg.dll
O18 - Protocol: grooveLocalGWS - {88FED34C-F0CA-4636-A375-3CB6248B04CD} - C:\Program Files\Microsoft Office\Office12\GrooveSystemServices.dll
O18 - Protocol: sacore - {5513F07E-936B-4E52-9B00-067394E91CC5} - C:\Program Files\McAfee\SiteAdvisor Enterprise\McIEPlg.dll
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: Cisco Systems, Inc. VPN Service (CVPND) - Cisco Systems, Inc. - C:\Program Files\Cisco Systems\VPN Client\cvpnd.exe
O23 - Service: McAfee SiteAdvisor Enterprise Service - McAfee, Inc. - C:\Program Files\McAfee\SiteAdvisor Enterprise\McSACore.exe
O23 - Service: Servicio de registro de McAfee (McAfeeFramework) - McAfee, Inc. - C:\Program Files\McAfee\Common Framework\FrameworkService.exe
O23 - Service: McAfee McShield (McShield) - McAfee, Inc. - C:\Program Files\Common Files\McAfee\SystemCore\\mcshield.exe
O23 - Service: McAfee Task Manager (McTaskManager) - McAfee, Inc. - C:\Program Files\McAfee\VirusScan Enterprise\VsTskMgr.exe
O23 - Service: McAfee Validation Trust Protection Service (mfevtp) - McAfee, Inc. - C:\WINDOWS\system32\mfevtps.exe
O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - C:\Program Files\Mozilla Maintenance Service\maintenanceservice.exe
O23 - Service: SigmaTel Audio Service (STacSV) - SigmaTel, Inc. - C:\Program Files\SigmaTel\C-Major Audio\WDM\StacSV.exe
O23 - Service: Dell Wireless WLAN Tray Service (wltrysvc) - Unknown owner - C:\WINDOWS\System32\WLTRYSVC.EXE
--
End of file - 6391 bytes