When trying to install Windows agents in SCOM 2012 R2, the task fails with error 0x80070002. Looking in the agent install log at C:\Program Files\Microsoft System Center 2012 R2\Operations Manager\Server\AgentManagement\AgentLogs I see "OmAgentFunctions::InstallOmAgentMsi : MsiInstallProductW() failed. HResult: 80070643".
SCOM agent install fails with error 0x80070002
scom
Best Answer
Instead of trying to push the agent from the SCOM server, try running the agent installer manually from the target server. The installer GUI may give you a better idea of why the install failed.
In my case the problem was that the System Center Advisor Agent was installed, which can not co-exist with the SCOM agent.