I have a problem with cmd.exe error, when i built my VS2005 project the cmd.exe error is occur.
And when i run cmd and type 'ipconfig' it doesn't activate. My friend's PC that share internet with me is fail.
I format my PC 2 times to fix this problem. But it work OK just only 2-3 days.
I search with google to fix this problem. I just only found the situation to fix VS2005 cmd.exe error, But 'ipconfig' still doesn't active.

Help me please.

I scan PC with HijackThis. This is log.

Logfile of HijackThis v1.99.1
Scan saved at 2:12:02, on 27/1/2550
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.5730.0011)

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:\WINDOWS\Explorer.EXE
C:\WINDOWS\SOUNDMAN.EXE
C:\WINDOWS\system32\RUNDLL32.EXE
C:\Program Files\Unlocker\UnlockerAssistant.exe
C:\Program Files\LClock\LClock.exe
C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\avp.exe
C:\Program Files\Java\jre1.5.0_09\bin\jusched.exe
C:\Program Files\DAEMON Tools\daemon.exe
C:\Program Files\ThaiSoftware Enterprise\ThaiSoftware Dictionary\Bin\MagicLnk.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Common Files\Autodesk Shared\Service\AdskScSrv.exe
C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\avp.exe
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorsvw.exe
F:\Program Files\Autodesk\3dsMax8\mentalray\satellite\raysat_3dsmax8server.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Program Files\Java\jre1.5.0_09\bin\jucheck.exe
C:\Program Files\BitComet\BitComet.exe
C:\Documents and Settings\Monkey_Kitten\Desktop\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
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
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_09\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
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: [UnlockerAssistant] C:\Program Files\Unlocker\UnlockerAssistant.exe -H
O4 - HKLM\..\Run: [LClock] C:\Program Files\LClock\LClock.exe
O4 - HKLM\..\Run: [Vistadrv] C:\WINDOWS\system32\vsdrv.exe
O4 - HKLM\..\Run: [AVP] "C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\avp.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.5.0_09\bin\jusched.exe"
O4 - HKLM\..\Run: [DAEMON Tools] "C:\Program Files\DAEMON Tools\daemon.exe" -lang 1033
O4 - HKLM\..\Run: [MagicLinker3] C:\Program Files\ThaiSoftware Enterprise\ThaiSoftware Dictionary\Bin\MagicLnk.exe
O4 - HKLM\..\Run: [MSConfig] C:\WINDOWS\PCHealth\HelpCtr\Binaries\MSConfig.exe /auto
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O8 - Extra context menu item: Add to Anti-Banner - C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\ie_banner_deny.htm
O8 - Extra context menu item: ส่&งออกไปยัง Microsoft Excel - res://C:\PROGRA~1\MICROS~3\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\IBM\Java142\jre\bin\NPJPI142.dll
O9 - Extra 'Tools' menuitem: IBM Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\IBM\Java142\jre\bin\NPJPI142.dll
O9 - Extra button: Web Anti-Virus - {1F460357-8A94-4D71-9CA3-AA4ACF32ED8E} - C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\scieplugin.dll
O9 - Extra button: การวิจัย - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O11 - Options group: [INTERNATIONAL] International*
O11 - Options group: [JAVA_IBM] Java (IBM)
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: ms-help - {314111C7-A502-11D2-BBCA-00C04F8EC294} - C:\Program Files\Common Files\Microsoft Shared\Help\hxds.dll
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O20 - AppInit_DLLs: "C:\PROGRA~1\KASPER~1\KASPER~1.0\adialhk.dll"
O20 - Winlogon Notify: klogon - C:\WINDOWS\system32\klogon.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\wpdshserviceobj.dll
O23 - Service: Autodesk Licensing Service - Autodesk - C:\Program Files\Common Files\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: Kaspersky Internet Security 6.0 (AVP) - Unknown owner - C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\avp.exe" -r (file missing)
O23 - Service: RaySat_3dsmax8 Server (mi-raysat_3dsmax8) - Unknown owner - F:\Program Files\Autodesk\3dsMax8\mentalray\satellite\raysat_3dsmax8server.exe
O23 - Service: SQL Server (SQLEXPRESS) (MSSQL$SQLEXPRESS) - Unknown owner - c:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn\sqlservr.exe" -sSQLEXPRESS (file missing)
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Windows Driver Foundation - User-mode Driver Framework (WudfSvc) - Unknown owner - hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,76,00,63,00,68,00,6f,00,73,00,74,00,2e,00,65,00,78,00,65,00,20,00,2d,00,6b,00,20,00,57,00,75,00,64,00,66,00,53,00,65,00,72,00,76,00,69,00,63,00,65,00,47,00,72,00,6f,00,75,00,70,00,00,00 (file missing)

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Did you try copying a "good" ipconfig.exe to system32?

this will do it also