You can upgrade Microsoft SQL Server 2008 Standard (x64) to Microsoft SQL Server 2008 Enterprise (x64), by Start > All Programs > Microsoft SQL server 2009 > Configuration Tools > SQL Server Installation Center (64-bit) > Maintenance > Edition Upgrade, but this can’t be done when there where updates installed on the standard edition. When updates are installed, first repair you’re installation to the original files and then upgrade to Microsoft SQL Server 2008 Enterprise. 

http://msdn.microsoft.com/en-us/library/ms143393.aspx

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