I tried installing it but failed so I jumped at Zenoss, a network monitoring software...the installation was a breeze. It also displays information about installed software, which I think you told me is what OCS does. I haven't played much with Zenoss, other than configure SNMP on SNMP capable devices
I didn't actually read the whole manual. the steps to setup a monitor are pretty simple. On windows its simple too....setup the SNMP and SNMP trap service, set the community, and you're set (after doing a few steps on zenoss).