Event ID 1228 - System Monitor was unable to open Active Directory Domain Services performance counters.

I have posted about this in the past with no success.

I get the following error periodically - any ideas on how to repair?

********************************************
Source: NTDS General
Category: Performance
Event ID: 1228
User (If Applicable): N/A
Computer: SERVER.domain.lan
Event Description: System Monitor was unable to open Active Directory Domain Services performance counters. An attempt to query the following performance counter registry key failed.

Registry key:
SYSTEM\CurrentControlSet\Services\DirectoryServices\Performance\First Counter

Additional Data

Error value:
2 The system cannot find the file specified.
Event Log Name: Directory Service
Event Log Type: error
Event Log Date Time: 2012-03-29 03:45:00
********************************************