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"Hi,
I’m trying to create a HELP using HTML Help Workshop. But when i try to
compile it, it gives following error : ‘HHC6003: Error: The file
Itircl.dll has not been registered correctly’. I tried to re-register
‘Itircl.dll’ and registered it successfully. But still getting the same
message. I don’t understand whether its a problem with DLL or Workshop.
I’m working in Windows XP environment. Can anybody help me to resolve
this problem." 

when  using hhc.exe to generate a chm,finding an error 

HHC6003: Error: The file Itircl.dll has not been registered correctly 

When
doing a Search in this HTML Help File (chm) file, no results are being
displayed on the search Tab, yet it may work on a different system.  

At the command prompt,typing (u should get itcc.dll and copy it to system32 dirctory first): 

regsvr32 c:windowssystem32itcc.dll 

an error occurs: 

The module "c:windowssystemitcc.dll" was loaded but the call to DllRegisterServer failed with error code 0x80070005" 

my system is win7,this command "regsvr32 c:windowssystem32itcc.dll" should be run as aministrator 

http://frogleg.mvps.org/helptechnologies/htmlhelp/hhtips.html#hhc6003