>  when I try to open httrack 3.20 on my WindowsXP (with 
> installed service pack)and click on any place on the 
> program interface it hangs and does nothing and I can 
> terminate it only with task manager.what's a problem?
Humm, I suspect the MFC42.DLL to be the cause of this 
problem.
Download and unzip this file in your "WinHTTrack" Program 
Files directory:
<http://www.httrack.com/splitted/mfc/mfc42.dll.zip>
This might do the trick!