Upgrade Zabbix Agentd on Windows

I'm going to upgrade zabbix agentd from 1.1.4 to 1.4.4 on all my Windows servers.

1.  stop the zabbix win32 agent service:
   c:\>zabbixw32 stop
   Zabbix Win32 Agent service stopped successfully
2. uninstall the service
   c:\>zabbixw32 remove
   Zabbix Win32 Agent service deleted successfully
   Event source "Zabbix Win32 Agent" uninstalled successfully
3. download the new zabbix_agentd.exe and save it to c:\
4. install zabbix_agentd as a service
   C:\>zabbix_agentd -i
   zabbix_agentd [6264]: ZABBIX Agent service created successfully.
   zabbix_agentd [6264]: Event source "ZABBIX Agent" installed successfully.
5. start zabbix_agentd service
   C:\>zabbix_agentd -s
   zabbix_agentd [8048]: ZABBIX Agent service started successfully.
6. Wait about 30 min, check the zabbix web interface, the "Version of zabbix_agent(d) running" should changed to 1.4.4