account lockout in windows

You can use the account lockout tools to find out why accounts are locking out
http://www.microsoft.com/en-us/download/details.aspx?id=18465

On server 2008 you have to make sure to run eventcombMT as administrator.
This http://support.microsoft.com/kb/977519 page says the account lockout ID is 4740

You can configure account lockouts in group policy under
Computer configuration -> Policies -> Windows Settings -> Account Policies/Account Lockout Policy