Thanks for the response . I have tried replacing iostream.h as susggested and then it is showing the link errors

LINK : warning LNK4199: /DELAYLOAD:OleAcc.dll ignored; no imports found from OleAcc.dll
1>stdafx.obj : error LNK2001: unresolved external symbol __afxForceEXCLUDE
1>thread.obj : error LNK2001: unresolved external symbol __afxForceEXCLUDE
1>WFTeams.obj : error LNK2001: unresolved external symbol __afxForceEXCLUDE
1>Workflow.obj : error LNK2001: unresolved external symbol __afxForceEXCLUDE
1>ADSI.obj : error LNK2001: unresolved external symbol __afxForceEXCLUDE
1>classes.obj : error LNK2001: unresolved external symbol __afxForceEXCLUDE
1>Database.obj : error LNK2001: unresolved external symbol __afxForceEXCLUDE
1>Service.obj : error LNK2001: unresolved external symbol __afxForceEXCLUDE
1>WFTeams.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>Workflow.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>Workflow.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>stdafx.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>thread.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>thread.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>WFTeams.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>Database.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>Database.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>Service.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>Service.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>ADSI.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>ADSI.obj : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3@YAXPAX@Z)
1>classes.obj : error LNK2001: unresolved external symbol "

I am trying to compile the old code from y server to deply into the new server and ever service code is facing this problem . I have installed visual studio 2008 and visual studio 2005 to compile these codes . while compileing the code in debug mode and release i am facing this error fatal error C1083: Cannot open include file: 'iostream.h': No such file or directory I tried to change it as then the following errors are displyed 1>.\WFTeams.cpp(97) : error C2065: 'cout' : undeclared identifier 1>.\WFTeams.cpp(97) : error C2065: 'flush' : undeclared identifier 1>.\WFTeams.cpp(397) : warning C4996: 'strcat' was declared deprecated 1> c:\Program Files (x86)\Microsoft Visual Studio 8\VC\include\string.h(78) : see declaration of 'strcat' 1> Message: 'This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_DEPRECATE. See online help for details.' 1>.\WFTeams.cpp(398) : warning C4996: 'strcat' was declared deprecated 1> c:\Program Files (x86)\Microsoft Visual Studio 8\VC\include\string.h(78) : see declaration of 'strcat' 1> Message: 'This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_DEPRECATE. See online help for details.' 1>Build log was saved at "file://d:\devcodes\WFTeams\Release\BuildLog.htm" 1>WFTeams - 2 error(s), 3 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== fatal error C1083: Cannot open include file: 'iostream.h': No such file or directory

code compilation is success an now i am trying to install and run the service in the production server . rReg.GetSZValue success if it successfully fetch the value from regtry path or else failed ,now it is returning fail in log . csConnectionStringReference contained the key name "TeamsConncetionstring" and this value is also ftched from the registry itself. csConnectionString should be stored with the value of the key "TeamsConncetionstring". GetLastError() returning 0 here . And if any error even will log with the error details which i have reported earlier.

lfLog.DebugMsgStart(" Retrieving Connection String");

csKey = "SOFTWARE\\Kimberly-Clark\\Knowledge Management";
if ( !rReg.GetSZValue(HKEY_LOCAL_MACHINE,csKey, csConnectionStringReference, csConnectionString))
{
// could not get program name
lfLog.DebugMsgEnd("FAILED");
csMsg.Format("Could not get the ConnectionString from Registry Key = '%s', Value = '%s'", csKey, csConnectionStringReference);
elLog.ErrorMsg(csMsg);
lfLog.ErrorMsg(csMsg);

  // log the message code
  mclLog.ErrorMsg( 0, "ConnectionString");
  goto exit30;

}
lfLog.DebugMsgEnd("SUCCESS");

and i am having the values in registry under the path mentioned in the code

I have given the value for the connetionstring and TeamsConnectionString in registry settings but s still i am facing the following error. can anyone please suggest me to resolve this error Error details from event details: --------------------------------- The following information was included with the event: Could not get the ConnectionString from Registry Key =SOFTWARE\Kimberly-Clark\Knowledge Management; Value = TeamsConnectionString Last error number: 0