Assuming you are trying to identify which Windows servers do not have the LEM Agent on it, you can use something like Dameware Remote Support and use it's exporter feature to dump an excel file on the software inventory
Remote Support Software | DameWare
If you have SAM, it can also do a software inventory scan for both Windows and Linux/Unix hosts.
http://oriondemo.solarwinds.com/Orion/NetPerfMon/NodeDetails.aspx?NetObject=N%3a574&ViewID=408