I was trying to install SQL Server 2008 Express edition, and installation wizard
gives, "SQL Server 2005 express tools already installed. " error. To proceed I need to remove SQL Server 2005 Express
tools.
I tried removing SQL Server 2005 Express tools from Uninstall Program window, but still the same error continues. In order to fix this you must remove following registry key from registry.
Solution
1) Open Run Menu and type regedit.
2) It will open Registry Editor
3) Now go to following location.
HKEY_LOCAL_MACHINE > Software > Wow6432Node > Microsoft > Microsoft SQL Server > 90
4) Right click on 90 and click on Delete.
5) Press Yes to confirm deletion.
Now try to install SQL Server 2008 and it would work this time.
I tried removing SQL Server 2005 Express tools from Uninstall Program window, but still the same error continues. In order to fix this you must remove following registry key from registry.
Solution
1) Open Run Menu and type regedit.
2) It will open Registry Editor
3) Now go to following location.
HKEY_LOCAL_MACHINE > Software > Wow6432Node > Microsoft > Microsoft SQL Server > 90
4) Right click on 90 and click on Delete.
5) Press Yes to confirm deletion.
Now try to install SQL Server 2008 and it would work this time.
