How to remove a failed install of Exchange 2010

I am having an issue with a fresh install of Exchange 2010 (fresh domain, no users, no data as yet) and for some reason the mailbox role did not install, below is the error I received:
Couldn't mount the database that you specified. Specified database: test; Error code: An Active Manager operation failed. Error: The database action failed. Error: Operation failed with message: MapiExceptionNotFound: Unable to mount database. (hr=0x8004010f, ec=-2147221233)
[Database: test, Server: SP-EX03.xxxx.xx].

I checked this error and set the DC via command line as per Microsoft's recommendation but when I load Exchange, the mailbox role hasn't been installed and I am getting an access denied error when trying to load the other roles.

I have no data here at all and no one is using this domain as it is in testing....

Any ideas? should I just remove and start again
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MASEE Solution Guide - Technical Dept HeadCommented:
If it is a test environment.
Install everything from scratch including domain. So you will get an error free Exchange

You can cleanup the Exchange

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minniejpAuthor Commented:
It is not possible to just remove Exchange and try again, without having to build the domain again from scratch - I have a forest with two child domains...i'm not sure what went wrong as all prepare work before hand worked without error
nashim khanExchange AdministratorCommented:

Please look in to the below link.

Nashim Khan
minniejpAuthor Commented:
I installed everything again from scratch..
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