problem with zabbix_agentd 1.4.1

[sunljhhust]

hello,
all
today, i upgrade zabbix1.1.4 to 1.4.1.

when i install agentd for windows, it doesn't work well. I see in the log file:

  1024:20070914:110623 zabbix_agentd started. ZABBIX 1.4.1.
  1076:20070914:110623 zabbix_agentd collector started
   860:20070914:110623 zabbix_agentd listener started
  1132:20070914:110623 zabbix_agentd listener started
   968:20070914:110623 zabbix_agentd listener started
  1032:20070914:110623 zabbix_agentd active check started [10.248.41.140:10051]
  1076:20070914:110623 Call to PdhCollectQueryData() failed: No data to return
 1076:20070914:110624 Call to PdhCollectQueryData() failed: No data to return
  1076:20070914:110625 Call to PdhCollectQueryData() failed: No data to return

i don't know why it can't access the performance data.

Thank you for your help

Amy