Event ID - 638

Event Id638
DescriptionSecurity Enabled Local Group Deleted:

Target Account Name: <Target Account Name>
      Target Domain: <Target Domain>
      Target Account ID: <Target Account ID>
      Caller User Name: <Caller User Name>
      Caller Domain: <Caller Domain>
      Caller Logon ID: <Caller Logon ID>
      Privileges: <Privileges>      

Event InformationAccording to Microsoft:
Cause :
This event record indicates that a local group has been deleted. There is no Failure Audit form of this audit event record.
Resolution :
This is an information event.
Reference LinksEvent ID 638 from Source Security

Alternate Event ID in Vista and Windows Server 2008 is 4734.

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