Hi!

Sometimes while browsing, suddenly I stop getting sites, but I am able to ping sites. If I reboot, it starts working correctly again.

Here is my HJT log-

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 15:12:52, on 18-10-2008
Platform: Windows Vista (WinNT 6.00.1904)
MSIE: Internet Explorer v7.00 (7.00.6000.16711)
Boot mode: Normal

Running processes:
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Program Files\Avira\AntiVir PersonalEdition Premium\avgnt.exe
C:\Windows\system32\taskeng.exe
C:\Users\tuse\AppData\Roaming\Google\Google Talk\googletalk.exe
C:\Program Files\DC++\DCPlusPlus.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.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://ie.redirect.hp.com/svs/rdr?TY...lion&pf=laptop
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://ie.redirect.hp.com/svs/rdr?TY...lion&pf=laptop
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://ie.redirect.hp.com/svs/rdr?TY...lion&pf=laptop
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O1 - Hosts: :::1 localhost
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: BitComet ClickCapture - {39F7E362-828A-4B5A-BCAF-5B79BFDFEA60} - C:\Program Files\BitComet\tools\BitCometBHO.dll
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_03\bin\jusched.exe"
O4 - HKLM\..\Run: [avgnt] "C:\Program Files\Avira\AntiVir PersonalEdition Premium\avgnt.exe" /min
O4 - HKCU\..\Run: [googletalk] C:\Users\tuse\AppData\Roaming\Google\Google Talk\googletalk.exe /autostart
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
O4 - HKLM\..\Policies\Explorer\Run: [status] present
O4 - HKUS\S-1-5-19\..\Run: [WindowsWelcomeCenter] rundll32.exe oobefldr.dll,ShowWelcomeCenter (User 'LOCAL SERVICE')
O4 - HKUS\S-1-5-20\..\Run: [WindowsWelcomeCenter] rundll32.exe oobefldr.dll,ShowWelcomeCenter (User 'NETWORK SERVICE')
O4 - Startup: OpenOffice.org 2.0.lnk = C:\Program Files\OpenOffice.org 2.0\program\quickstart.exe
O4 - Startup: Update Center Client Tray.lnk = ?
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~3\Office12\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\Office12\REFIEBAR.DLL
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search && Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O16 - DPF: {193C772A-87BE-4B19-A7BB-445B226FE9A1} (ewidoOnlineScan Control) - http://downloads.ewido.net/ewidoOnlineScan.cab
O16 - DPF: {AF2E62B6-F9E1-4D4F-A10A-9DC8E6DCBCC0} - http://update.videoegg.com/Install/W...gPublisher.exe
O17 - HKLM\System\CCS\Services\Tcpip\..\{8E186FE9-942B-426D-A4E2-7049491716A3}: NameServer = 172.16.200.3
O23 - Service: Avira AntiVir Premium MailGuard (AntiVirMailService) - Avira GmbH - C:\Program Files\Avira\AntiVir PersonalEdition Premium\avmailc.exe
O23 - Service: Avira AntiVir Premium Scheduler (AntiVirScheduler) - Avira GmbH - C:\Program Files\Avira\AntiVir PersonalEdition Premium\sched.exe
O23 - Service: Avira AntiVir Premium Guard (AntiVirService) - Avira GmbH - C:\Program Files\Avira\AntiVir PersonalEdition Premium\avguard.exe
O23 - Service: Avira AntiVir Premium WebGuard (antivirwebservice) - Avira GmbH - C:\Program Files\Avira\AntiVir PersonalEdition Premium\AVWEBGRD.EXE
O23 - Service: Avira AntiVir Premium MailGuard helper service (AVEService) - Avira GmbH - C:\Program Files\Avira\AntiVir PersonalEdition Premium\avesvc.exe
O23 - Service: CyberLink Background Capture Service (CBCS) (CLCapSvc) - Unknown owner - --"C:\Program Files\HP\QuickPlay\Kernel\TV\CLCapSvc.exe" (file missing)
O23 - Service: CyberLink Task Scheduler (CTS) (CLSched) - Unknown owner - --"C:\Program Files\HP\QuickPlay\Kernel\TV\CLSched.exe" (file missing)
O23 - Service: Google Updater Service (gusvc) - Unknown owner - --"C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe" (file missing)
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Unknown owner - --"C:\Program Files\Common Files\LightScribe\LSSrvc.exe" (file missing)
O23 - Service: Machine Debug Manager (MDM) - Unknown owner - --"C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE" (file missing)
O23 - Service: OracleMTSRecoveryService - Oracle Corporation - C:\oraclexe\app\oracle\product\10.2.0\server\BIN\omtsreco.exe
O23 - Service: OracleServiceXE - Oracle Corporation - c:\oraclexe\app\oracle\product\10.2.0\server\bin\ORACLE.EXE
O23 - Service: OracleXEClrAgent - Unknown owner - C:\oraclexe\app\oracle\product\10.2.0\server\bin\OraClrAgnt.exe
O23 - Service: OracleXETNSListener - Unknown owner - C:\oraclexe\app\oracle\product\10.2.0\server\BIN\tnslsnr.exe
O23 - Service: @%SystemRoot%\System32\TuneUpDefragService.exe,-1 (TuneUp.Defrag) - TuneUp Software GmbH - C:\Windows\System32\TuneUpDefragService.exe
O23 - Service: wampapache - Apache Software Foundation - c:\wamp\bin\apache\apache2.2.8\bin\httpd.exe
O23 - Service: wampmysqld - Unknown owner - c:\wamp\bin\mysql\mysql5.0.51a\bin\mysqld-nt.exe
O23 - Service: XAudioService - Conexant Systems, Inc. - C:\Windows\system32\DRIVERS\xaudio.exe

--
End of file - 7008 bytes

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Do you think xaudio may be causing the problem? This process seems to be running all the time and I do not connect to the internet using a dial up.

I think you could do with cleaning your registry out to deal with those "file missing" cases.

I would also remove BitCometHO.dll from your system and registry as this snoops on you.

XAUDIO.EXE - well I would suppress it. Better gurus than me would know whether there is something in there that kicks in to terminate a session - I rather think not, though you could look at your Internet settings in Tools - but you've already done all that I'm sure.

I couldn't see anything in the HJT that isn't covered above and, of course, we all lose the internet from time to time when the ISP glitches.