I have installed OM 8.16 in my test mechine, Windows Server 2003 SP2 . It installed properly , and i have opended the OMW console .
Then i have installed OVPM 9.0 ,during installation it dint gave any error . After that i have rebooted the mechine and tried to open the oMW Console ,it gave error as attached screen-shot . But OVPM working properly .
When you run the commands in the OMW 8.16 server do they show all process/services are running
Have you tried launching the OMW Web Console and see if that works or even that fails to load?
OMW 8.1x server is an old server and so you may want to upgrade the agent to OA 11.0x (HP has stopped supporting OM 8.x agents for some time now). I am not sure if it will help here but it will atleast get your server to more current configurations. Also if you plan to install any of the OMW 8.1x server patches then you would need to update the agent anyway as well.