Failed to initialise TPM error

If you get an error (0x80070005) when initialising TPM for Bitlocker and you have GP set to 'Save the recovery key to AD' then make sure the computer object has Write permissions to itself in AD.

Error when opening Server Manager MMC snap-in

If you are getting {18ea3f92-d6aa-41d9-a205-2023400c8fbb} when trying to open Server Manager on Windows Server 2008. Go to C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG folder > rename current machine.config file > make copy of current.machine.default file > rename it to machine.config