Salve a tutti, sono nuovo iscritto e complimenti per il forum.
Ho problemi con la navigazione con chiavetta marcata tim internet onda mt503hs 7.2 mega con sim wind,
da circa una settimana la velocità trasmissione varia da 1 a 2 kbps.
ho fatto una scansione con hijackthis allego il log, grazie.

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 17.12.46, on 24/04/2012
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.17109)
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:\WINDOWS\system32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\SupportAppXL\cdrom_mon.exe
C:\Programmi\ESET\ESET NOD32 Antivirus\ekrn.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\File comuni\Nero\Nero BackItUp 4\NBService.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\ESET\ESET NOD32 Antivirus\egui.exe
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\Programmi\Trend Micro\HijackThis\HiJackThis.exe
C:\Programmi\Microsoft Office\Office12\WINWORD.EXE

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://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: Groove GFS Browser Helper - {72853161-30C5-4D22-B7F9-0BBC1D38A37E} - C:\Programmi\Microsoft Office\Office12\GrooveShellExtensions.dll
O2 - BHO: Guida per l'accesso a Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Programmi\File comuni\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O2 - BHO: DAPIELoader Class - {FF6C3CF0-4B15-11D1-ABED-709549C10000} - C:\PROGRA~1\DAP\dapieloader.dll
O3 - Toolbar: HopSurf toolbar - {E9FAB13D-4600-49E1-90D1-EE961C859D39} - C:\Programmi\Comodo\HopSurfToolbar\HopSurfToolbar_IE.dll
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [egui] "C:\Programmi\ESET\ESET NOD32 Antivirus\egui.exe" /hide /waitservice
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO DI RETE')
O8 - Extra context menu item: &Clean Traces - C:\Programmi\DAP\Privacy Package\dapcleanerie.htm
O8 - Extra context menu item: &Download with &DAP - C:\Programmi\DAP\dapextie.htm
O8 - Extra context menu item: Download &all with DAP - C:\Programmi\DAP\dapextie2.htm
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O8 - Extra context menu item: Google Sidewiki... - res://C:\Programmi\Google\Google Toolbar\Component\GoogleToolbarDynamic_mui_en_7461B1589E8B4FB7.dll/cmsidewiki.html
O9 - Extra button: Invia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: I&nvia 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: Crawler Screensaver - {CDAFD956-97BE-443D-8EF7-F4F094EB5766} - C:\WINDOWS\system32\shdocvw.dll
O9 - Extra button: HopSurf - {ED98F8D1-09AC-4107-B2FF-91DBE011B0C5} - C:\Programmi\Comodo\HopSurfToolbar\HopSurfToolbar_IE.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
O18 - Protocol: grooveLocalGWS - {88FED34C-F0CA-4636-A375-3CB6248B04CD} - C:\Programmi\Microsoft Office\Office12\GrooveSystemServices.dll
O20 - AppInit_DLLs: ??? "C:\PROGRA~1\Google\Google Desktop Search\GoogleDesktopNetwork3.dll"
O22 - SharedTaskScheduler: Precaricatore Browseui - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - C:\WINDOWS\system32\browseui.dll
O22 - SharedTaskScheduler: Daemon di cache delle categorie di componenti - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\WINDOWS\system32\browseui.dll
O23 - Service: Adobe Flash Player Update Service (AdobeFlashPlayerUpdateSvc) - Adobe Systems Incorporated - C:\WINDOWS\system32\Macromed\Flash\FlashPlayerUpdateService.exe
O23 - Service: Autorun CDROM Monitor - Unknown owner - C:\WINDOWS\system32\SupportAppXL\cdrom_mon.exe
O23 - Service: Eset HTTP Server (EhttpSrv) - ESET - C:\Programmi\ESET\ESET NOD32 Antivirus\EHttpSrv.exe
O23 - Service: Eset Service (ekrn) - ESET - C:\Programmi\ESET\ESET NOD32 Antivirus\ekrn.exe
O23 - Service: Google Desktop Manager 5.9.1005.12335 (GoogleDesktopManager-051210-111108) - Google - C:\Programmi\Google\Google Desktop Search\GoogleDesktop.exe
O23 - Service: Servizio di Google Update (gupdate) (gupdate) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: Nero BackItUp Scheduler 4.0 - Nero AG - C:\Programmi\File comuni\Nero\Nero BackItUp 4\NBService.exe
O23 - Service: ServiceLayer - Nokia - C:\Programmi\Nokia\PC Connectivity Solution\ServiceLayer.exe

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End of file - 6112 bytes

tutto risolto, avevo superato la soglia dei download.