Probably Event IDs 636 and 637 as shown in the description of account
management events in the link below. Below is an example I just generated
on my computer so you can see one. The caller user name is the user that
added the user to the administrators group. --- Steve
http://www.microsoft.com/resources/...Windows/XP/all/reskit/en-us/prnf_msg_zzss.asp
Event Type: Success Audit
Event Source: Security
Event Category: Account Management
Event ID: 636
Date: 1/12/2006
Time: 10:28:09 PM
User: STEVE-XP\Steve
Computer: STEVE-XP
Description:
Security Enabled Local Group Member Added: <<<<<<<<<<<<
Member Name: -
Member ID: STEVE-XP\Darth <<<<<<<<<<
Target Account Name: Administrators <<<<<<<<<<<<<
Target Domain: Builtin
Target Account ID: BUILTIN\Administrators
Caller User Name: Steve <<<<<<<<<<<<<
Caller Domain: STEVE-XP
Caller Logon ID: (0x0,0x2F42A2)
Privileges: -
For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.