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SQL Server 2008 R2 - No Instance Name

I am trying to upgrade from VMware 5.0 to VMware 5.1. The Single Sign On service requires a SQL Server Database but it has to be at root because you cannot reference a SQL Server Instance Name. Currently my vCenter Server where I am trying to update to 5.1 has the server name and instance name which is:    VCENTER\VIM_SQLEXP

Can you install SQL Server 2008 R2 Express without an instance name so that the database is at root? If so how can that be done? I can always install SQL Server Express on a different server to host the SSO database but during the install its prompting for a instance name.
Avatar of Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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Personally, I would not bother with an upgrade, unless you really have to, because of the many issues which occur with upgraded systems.

Install a new fresh vCenter 5.1 with SSO.
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ASKER

The only reason i prefer not to perform a fresh install is that my vCenter server is a physical server (and a new one at that) and I kind of prefer keeping it physical... on that note for an environment with 3 ESXi Hosts and 2 FC SAN's is there a benfit to keeping my ESXi host physical?
physical and virtual servers are both supported for vCenter Server.

virtual servers have greater benefits, backup, DR etc

if its physical easy to reinstall, just uninstall.
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DataPimper

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before perform this upgrade take backup of all these database.
and remember user name and password that authenticate the sql instance.
This was the correct answer and has allowed me to continue with my setup. Thank you!