MS ESENT keys are required - Agent Install (2007R2)

Hi,

Having an issue installing the SCOM 2007R2 agent on to a Windows 2008 Server (Not R2).

There is no ESENT key in the registry.

I have many 2008R2 servers with the ESENT key, but I'm not sure if I can import that key in to 2008. The esent.dll is a different size to the one on 2008R2 as well.

The error code from the Management Server where I am trying to install from is 80070643. I've checked that on Kevin H's blog, but it only talks about Windows Update, which seems OK to me on this box.

Also, tried logging on locally to install but get the error: Microsoft ESENT keys are required to install this application......

Already tried this too:

http://social.technet.microsoft.com/Forums/systemcenter/en-US/def8d8b3-4ed0-4ebd-bf3e-d42e04752b7b/agent-install-error-microsoft-esent-keys-are-required-to-install-this-application

Thx

John Bradshaw