I've installed zabbix_agentd 1.4.4 into my Windows Vista box.
I got following error.

C:\zabbix_agents\win32>zabbix_agentd -c ..\zabbix_agentd.conf -p
agent.ping [u|1]
agent.version [s|1.4.4]
system.localtime [u|1205126015]
system.run[echo test] [t|test]
.... <snip> ....
system.swap.size[all,free] [u|3165270016]
system.swap.in[all] [m|ZBX_NOTSUPPORTED]
system.swap.out[all,count] [m|ZBX_NOTSUPPORTED]
zabbix_agentd [3660]: Error: PdhLookupPerfNameByIndex failed: 3. MSG 0x800007D0

• Unable to find message text [0x13D]
  zabbix_agentd [3660]: Error: PdhLookupPerfNameByIndex failed: 3. MSG 0x800007D0
• Unable to find message text [0x13D]
  system.uptime [m|ZBX_NOTSUPPORTED]
  service_state[ZABBIX Agent] [u|0]
  ... <snip>.....