When installing the HL Accelerator on BizTalk Server 2009, BizTalk Server 2010, or BizTalk Server 2013, the following error occurs:
The specified account "Domain\AccountName" is invalid. Error code: The handle is invalid.
This is being investigated by the BizTalk product group. In the meantime, these steps should work if the 2871997 update applies to your server.