Windows Vista, Windows Server 2008, and later versions of Windows improve your ability
to troubleshoot Group Policy not only with RSOP tools but also with improved logging of
Group Policy events.
The System log provides high-level information about Group Policy, including errors created by the Group Policy Client when it cannot connect to a domain controller or locate GPOs. The Application log captures events recorded by CSEs. The Group Policy Operational Log provides detailed information about Group Policy processing.
To find these Group Policy logs, open the Event Viewer snap-in or console. The System and Application logs are in the Windows Logs node. The Group Policy Operational Log is found in Applications And Services LogsMicrosoftWindowsGroupPolicyOperational.