I was playing Half-Life Source earlier and started getting some graphical glitches, followed by a display driver crash, then a system crash. When I rebooted, I got the "This system has recovered from a serious error" message.

Everything seemed fine until I tried loading Steam (content delivery application) again. Didn't load. I tried pinging steampowered.com and got the message "Destination host unreachable". I pinged it on my laptop and got the same error.

Visiting steampowered.com in a browser resulted in a timeout on this computer, but it loaded fine on the laptop. A large number of websites return the same "Destination host unreachable" error on every computer in the network, but load fine on every computer but this one. manual.americasarmy.com and forums.beyondunreal.com are two that come to mind.

I've tried repairing the connection in Windows, but that didn't fix anything. I also restored the system to a point two days ago, but that didn't help either.

I've lost connection and had to reset th modem and router twice tonight but I don't know if that's related to these problems.

Here's a HijackThis log (which, by the way, wouldn't load on the desktop either - I had to download it on the laptop and save the installer to this computer).

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 2:46:02, on 2/22/2009
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16791)
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\spoolsv.exe
C:\AC Web Ultimate Repack\Server\apache\bin\apache.exe
C:\program files\Cerberus\Cerberus.exe
C:\Program Files\DynDNS Updater\DynUpSvc.exe
C:\AC Web Ultimate Repack\Server\mysql\bin\mysqld.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\Alcohol Soft\Alcohol 52\StarWind\StarWindServiceAE.exe
C:\Program Files\Unreal3.2\wircd.exe
C:\Program Files\Common Files\Softwin\BitDefender Communicator\xcommsvr.exe
C:\Program Files\Common Files\Softwin\BitDefender Scan Server\bdss.exe
C:\Program Files\Common Files\Softwin\BitDefender Update Service\livesrv.exe
C:\AC Web Ultimate Repack\Server\apache\bin\apache.exe
C:\Program Files\BitDefender\vsserv.exe
C:\WINDOWS\system32\devldr32.exe
C:\WINDOWS\RTHDCPL.EXE
C:\Program Files\Razer\Copperhead\razerhid.exe
C:\Program Files\Spamihilator\spamihilator.exe
C:\Program Files\Vista Drive Icon\DrvIcon.exe
C:\Program Files\BitDefender\bdmcon.exe
C:\Program Files\BitDefender\bdagent.exe
C:\Program Files\uTorrent\uTorrent.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Razer\Copperhead\razertra.exe
C:\Program Files\PeerGuardian2\pg2.exe
C:\Program Files\Razer\Copperhead\razerofa.exe
C:\Program Files\mIRC\mirc.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Opera\opera.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = MSN.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = Live Search
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = Live Search
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = MSN.com
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre6\bin\ssv.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\5.0.926.3450\sw g.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O4 - HKLM\..\Run: [IMJPMIG8.1] "C:\WINDOWS\IME\imjp8_1\IMJPMIG.EXE" /Spoil /RemAdvDef /Migration32
O4 - HKLM\..\Run: [PHIME2002ASync] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /SYNC
O4 - HKLM\..\Run: [PHIME2002A] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /IMEName
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [razer] C:\Program Files\Razer\Copperhead\razerhid.exe
O4 - HKLM\..\Run: [Spamihilator] "C:\Program Files\Spamihilator\spamihilator.exe"
O4 - HKLM\..\Run: [DrvIcon] C:\Program Files\Vista Drive Icon\DrvIcon.exe
O4 - HKLM\..\Run: [BDMCon] "C:\Program Files\BitDefender\bdmcon.exe" /reg
O4 - HKLM\..\Run: [BDAgent] "C:\Program Files\BitDefender\bdagent.exe"
O4 - HKCU\..\Run: [Steam] "c:\program files\steam\steam.exe" -silent
O4 - HKCU\..\Run: [uTorrent] "C:\Program Files\uTorrent\uTorrent.exe"
O4 - HKCU\..\Run: [AlcoholAutomount] "C:\Program Files\Alcohol Soft\Alcohol 52\axcmd.exe" /automount
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [PeerGuardian] C:\Program Files\PeerGuardian2\pg2.exe
O4 - Startup: mIRC.lnk = C:\program files\mIRC\mirc.exe
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: {1E54D648-B804-468d-BC78-4AFFED8E262E} (System Requirements Lab) - http://www.nvidia.com/content/Driver...sysreqlab3.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{B8ECDFEA-0E9A-4B9E-90E9-2E1B43271C81}: NameServer = 192.168.2.1
O23 - Service: Apache2.2 - Apache Software Foundation - C:\AC Web Ultimate Repack\Server\apache\bin\apache.exe
O23 - Service: BitDefender Scan Server (bdss) - Unknown owner - C:\Program Files\Common Files\Softwin\BitDefender Scan Server\bdss.exe
O23 - Service: Cerberus FTP Server - Cerberus, LLC - C:\program files\Cerberus\Cerberus.exe
O23 - Service: DynDNS Updater - Dynamic Network Services, Inc. - C:\Program Files\DynDNS Updater\DynUpSvc.exe
O23 - Service: Google Software Updater (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: BitDefender Desktop Update Service (LIVESRV) - SOFTWIN S.R.L. - C:\Program Files\Common Files\Softwin\BitDefender Update Service\livesrv.exe
O23 - Service: mysql - Unknown owner - C:\AC.exe (file missing)
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: StarWind AE Service (StarWindServiceAE) - Rocket Division Software - C:\Program Files\Alcohol Soft\Alcohol 52\StarWind\StarWindServiceAE.exe
O23 - Service: UnrealIRCd - none - C:\Program Files\Unreal3.2\wircd.exe
O23 - Service: BitDefender Virus Shield (VSSERV) - SOFTWIN S.R.L. - C:\Program Files\BitDefender\vsserv.exe
O23 - Service: BitDefender Communicator (XCOMM) - SOFTWIN S.R.L - C:\Program Files\Common Files\Softwin\BitDefender Communicator\xcommsvr.exe

--
End of file - 6265 bytes

This does not appear to be a malware problem.

I'm almost certain it isn't malware, just some configuration or setting or something that's wrong.

Okay I just installed Hamachi for a few things and now all of these problems are fixed again. Seeing as Hamachi does some stuff involving your connection I guess that somehow fixed it.

Great to hear tony311.

We can mark this one resolved then.

Please let us know if things stay that way and feel free to come back to ask if there are any more questions!!

...ugh. I installed some IPX protocol for the Hamachi connection or something and guess what? all those websites started not working again.

So I tried uninstalling Hamachi and reinstalling, hoping that whatever happened last time will happen again, but it didn't.