Database – Error when trying to view properties in Management Studio

I am having trouble with sql manager after install SQL 2005 SP3,

Can any shed any light on this one.

Thanks

TITLE: Microsoft SQL Server Management Studio

Cannot show requested dialog.

ADDITIONAL INFORMATION:

Cannot show requested dialog. (SqlMgmt)

Method not found: 'Microsoft.SqlServer.Management.Smo.Edition Microsoft.SqlServer.Management.Smo.Information.get_EngineEdition()'. (SqlManagerUI)

BUTTONS:

OK