The following Registry files are stored in C\Windows\System32\Config\ in XP :
Sam - HKEY_LOCAL_MACHINE\SAM
Security - HKEY_LOCAL_MACHINE\SECURITY
Software - HKEY_LOCAL_MACHINE\SOFTWARE
System - HKEY_LOCAL_MACHINE\SYSTEM
Default - HKEY_USERS\.DEFAULT
Userdiff
The following file is stored in each user's profile folder:
NTUSER.DAT
more at (where else
) *en.wikipedia.org/wiki/Windows_registry
also check this *freepctech.com/pc/002/Windows_registry_faq.shtml