Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)) - by Alberto Morillo

Status : 

  Not Reproducible<br /><br />
		The product team could not reproduce this item with the description and steps provided.<br /><br />
		A more detailed explanation for the resolution of this particular item may have been provided in the comments section.

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ID 334218 Comments
Status Closed Workarounds
Type Bug Repros 1
Opened 3/24/2008 6:13:23 PM
Access Restriction Public


ERROR.  Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))

This error came when we try to open a table on a database stored on a SQL Server 2005 instance using SQL Server Management Studio 2005 after installing SQL Server 2008 (Katmai - CTP 5 November 2007) for testing purposes on the same machine.


Rebuild SQL Server 2005 Registry running setup from the command prompt with the REINSTALL=ALL and REINSTALLMODE=omus parameters.

Please visit for the solution step by step.

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Posted by Microsoft on 4/14/2008 at 11:03 AM
Alberto - we were able to perform the reproduction steps as described, using our latest build. I'll close this one and you can let me know if you're still seeing this.

Thanks! -

Buck Woody, SQL Server Program Manager