I have a large set of unattended Windows XP machines who are not connected to a domain or even to each other. I am struggling to find any tools out there that I can use to deal with them in one application.

I am hoping to find software that I can perhaps install a client on each machine, then have it essentially proxy out configuration information and possibly commands (install, uninstall, stop service, etc) across the whole network.

The closest I've come is Nagios and its client, but it cannot be used to push files through and run commands remotely.

Any suggestions?