Manual Uninstall of SQL 2005 (32 / 64bit) Server or Express (including Reporting Services)


Uninstalling SQL 2005 Manually

First, here are the recommended steps to manually uninstall SQL 2005:

If that doesn’t work, this is how you can manually uninstall all versions of SQL 2005 so that SQL can be reinstalled: .

Note – This method will delete all databases and configuration, you must have a backup of your existing SQL databases (which this uninstall will delete) before proceeding.

  1. Uninstall all SQL components possible in Add/Remove Programs (including the SQL client and VSS writer)
  2. Stop all SQL Services and configure them to disabled using Start > SQL Configuration Manager
  3. Delete the following registry to get rid of the services. If you have multiple instance installed, it will be Keyname$Instance (i.e. MSSQLServer$OFFICESERVERS)
    1. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSSQLServer
    2. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SQLServerAgent
    3. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSSQLServerADHelper
    4. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ReportServer
    5. Verify that the services do not exist in the SQL Configuration Manager.
  4. Delete the SQL Configuration in the registry
    2. HKEY_LOCAL_MACHINE\Software\Microsoft\Microsoft SQL Server
    3. Note – if you installed a 32 bit version of SQL on 64 bit version of Windows, you will need to also delete them from the 32 bit registry node that is redirected. More Info MS 896459.
      * HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432node\Microsoft\MSSQLServer
      * HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432node\Microsoft\Microsoft SQL Server
  5. Delete the SQL Program files – Note this will also delete the existing databases on the system that must be restored from backup.
    1. Delete the directory: C:\Program Files\Microsoft SQL Server
      Note – if you installed a 32 bit version of SQL on 64 bit version of Windows, you will need to also delete them from the 32 bit program files:
      C:\Program Files (x86)\Microsoft SQL Server
    2. You might need to reboot to close all files before you can delete the directory.

Now you can reinstall a clean 32 bit or 64 bit SQL without errors.

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