Nagios Client for Windows

Download NSClient from:

http://nsclient.ready2run.nl/download.htm

then:

Copy pNSClient.exe, pdh.dll, psapi.dll and counters.defs in any directory on the machine you want to monitor. ie. (c:\nsclient).
Open a dos prompt in the installation directory
Run the following command : >pNSClient.exe /install
Type 'net start nsclient' on the command line or start the service 'Nagios Agent' in the services applet of the control panel.
The installation will create an entry for the service in the registry and create a new key to store parameters. The created key is the following:

HKEY_LOCAL_MACHINE\SOFTWARE\NSClient


Be careful of FIREWALL!!