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I would like to upgrade my SQL Server 2005 Express instance which is installed using this command:

SQLEXPR.EXE/qs /action=INSTALL /IACCEPTSQLSERVERLICENSETERMS 
   /FEATURES=SQLEngine /INSTANCENAME=ABCD
   /SQLSVCACCOUNT="NT AUTHORITY\SYSTEM" /SECURITYMODE=SQL
   /SAPWD=abc#Wd1234 /TCPENABLED=1 /NPENABLED=1

but when I am trying to upgrade the server instance ABCD with this command

SQLEXPR_x64_ENU.exe /q /ACTION=upgrade /INSTANCENAME=ABCD /IACCEPTSQLSERVERLICENSETERMS=1

the instance ABCD is not upgraded to SQL Server 2008 R2 Express.

When I check ADD/Remove program list of OS, it shows me both SQL Server 2005 and 2008 R2 are installed (that may be I am doing a side by side upgrade but not a in-place one) and when I click on start button of OS and then goes to SQL Server 2008 R2 folder in AllPrograms list. It has a sub folder configuration tools which contains SQL Server Installation center. When I open the installation center it show various option to install SQL Server 2008 R2 or to upgrade from 2005 etc. I am confused whether SQL Server 2008 R2 is even installed on my machine after running the above 2nd query. Please help me where I am going wrong.

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    Are you sure the 2005 instance is 64-bit? What happens if, instead of the command line, you run setup through the UI, and select the upgrade option? Maybe you'll get better information about what's going wrong... – Aaron Bertrand May 22 '13 at 16:01
  • when i used the query select @@Version it gives result as Microsoft SQL Server 2005 - 9.00.5000.00 (Intel X86) Dec 10 2010 10:56:29 Copyright (c) 1988-2005 Microsoft Corporation Express Edition on Windows NT 6.1 (Build 7601: Service Pack 1 .so it might be 32-bit instance but what i am not able to understand is that my machine is windows 7 64 bit and i am installing sql server 2005 express edition 64 bit installer then why is it making a 32-bit instance ?? – ABHI May 23 '13 at 6:24
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You have a 32-bit instance of SQL Server 2005 and are trying to upgrade to a 64-bit instance of a newer version. This is not supported; you can check any of the upgrade documents about this, e.g. http://msdn.microsoft.com/en-us/library/ms143393(v=sql.105).aspx:

Cross-platform upgrade is not supported. You cannot upgrade a 32-bit instance of SQL Server to native 64-bit.

It says stuff about WOW64 but my recommendation for your scenario is to install a separate 2008 R2 instance, backup/restore your databases from the 2005 instance (and transfer jobs/logins), then remove that instance. You will need to choose a different instance name or use a default instance.

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