When you try to add a host to System Center Virtual Machine Manager 2008 it fails with the following message: Error (2912)
An internal error has occurred trying to contact an agent on the server.domain.com server. (Unknown error (0xc0000bbf)). Cause: This occurs when the performance counters are corrupt on the host you are trying to add.
Resolution: To rebuild extensible counters, third-party counters, and all other performance counters follow these steps: 1. Open an elevated Command Prompt window. 2. At the command prompt, type the following command, and then press ENTER:  cd\windows\system32 3. At the command prompt, type the following command and then press ENTER: lodctr /R Note: In this command, "R" is uppercase. 4. At the command prompt, type exit , and then press ENTER to close the Command Prompt window.