SNMP deployment, large network

Hello everyone:

I've been looking for a transparent deployment of the snmp service but no
luck.

I really dun have the time to install the service+snmp informant in 500+
PC's and servers before a deadline my company gave me.

I've been using it for a while on a  testing enviroment but there was only
10 devices to play with...now im going for the big shot.

I know there are commands to install services from remote locations, but im
being challenged by a microsoft solution called SMS server...it installs a
client silently anywhere you want (of course killing bandwidth i guess). I
would like to offer my company something closer to this and open source.

Thanks for the time reading this

Rgds
Ulrich