So after resolving the issue below with regards to installing Lync Server using the wrong credentials, i then hit another problem with the Central Management Store. This time the error was...
Error: An error occurred: "System.UnauthorizedAccessException" "Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))"
And the event log showed the following...
Log Name: System
Date: 15/11/2010 11:00:36
Event ID: 6037
Task Category: None
The program sqlservr.exe, with the assigned process ID 2368, could not authenticate locally by using the target name MSSQLSvc/testpool.lynctest.local:49245. The target name used is not valid. A target name should refer to one of the local computer names, for example, the DNS host name. Try a different target name.
I determined that this was because of loopback checking in my particular setup. In that the hostname of my Lync pool server was lyncpool.lynctest.local and my pool name was lynctest.lynctest.local.
The solution was to add a registry key to disable loopback checking.
Run regedit and browse to the following...
Create a dword with the following values
Oh, and Kudos to Kevin Feasel who's blog i found this solution on.