Pls. help i have server 2008 environ ment and want to make the disable a computer object if it is not already created in AD.

Means: if any engineer try to join a machine name xyz so it should not join the domain and make disable this object in AD because administrator not create any machine object xyz in AD.

More Clear: if i create a machine object abc in AD and engeen put the same name to computer and thern join to domain then machine success fully join else if engineer try to join other host name that is not exist in AD then this object make desible and move to default computer OU.