Parece que você precisa gerar um novo Identificador de segurança (SID) . Certifique-se de que a máquina tenha ingressado em um "Grupo de Trabalho" em vez de "Domínio" (se você tentou fazer com que ele ficasse no domínio e ele falhou, mas continua sendo mostrado como estando no domínio, desassocie e reinicialize). Em seguida, baixe e execute o aplicativo NewSID da SysInternal
De: link
How it Works
NewSID starts by reading the existing
computer SID. A computer's SID is
stored in the Registry's SECURITY hive
under SECURITY\SAM\Domains\Account.
This key has a value named F and a
value named V. The V value is a binary
value that has the computer SID
embedded within it at the end of its
data. NewSID ensures that this SID is
in a standard format (3 32-bit
subauthorities preceded by three
32-bit authority fields).
Next, NewSID generates a new random
SID for the computer. NewSID's
generation takes great pains to create
a truly random 96-bit value, which
replaces the 96-bits of the 3
subauthority values that make up a
computer SID.
Three phases to the computer SID
replacement follow. In the first
phase, the SECURITY and SAM Registry
hives are scanned for occurrences of
the old computer SID in key values, as
well as the names of the keys. When
the SID is found in a value it is
replaced with the new computer SID,
and when the SID is found in a name,
the key and its subkeys are copied to
a new subkey that has the same name
except with the new SID replacing the
old.
Reinicie após o computador ter sido renomeado e tente conectá-lo ao domínio novamente.