For more information on why you must change the SID for workgroups and domains, see the section "Security identifier (SID) for workstations participating in a domain" in the document Introduction to cloning a Windows NT, Windows 2000, or Windows XP computer.
SIDs and security
Many programs, including Windows itself, base security features on the SID and the computer name.
The parts the SID changer needs to change
When the SID changer cannot locate and change all instances of the SID and computer name, or locate and change proprietary calculated values that are based on the SID and computer name, some applications or Windows features may not work on the destination computer after changing the SID.
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