Mike,
Give these instructions a try.
After you detach the databases -
From add/remove programs....
Uninstall Microsoft SQL Server 2005/2008
Remove instances one at a time. Most likely you will have a deafult SQLSERVER instance and a JDESSELocal instance.
Uninstall SQL Native Client
Uninstall Setup Support Files
Uninstall VSS Writer
Uninstall MSXML 6.0 Parser
Delete entire Microsoft SQL Server directory from x:\Program Files,
then reboot
Install SQL Server 2005 from x:\JDEdwards\E812\OneWorld Client
Install\ThirdParty\SSE\SQLEXPR.EXE
Choose default instance.
Run this command in a command prompt from this location:
x:\jdedwards\e812\oneworld client
install\thirdparty\SSE>DotNetSSESetup.exe -PSaSaSa11 -IJDESSELocal
Run this command from this location:
e:\jdedwards\e812\system\bin32>ReconfigureMSDE.exe -TSSE
-I(local)\JDESSELocal -pSaSaSa11
Run SSE_attach_planner.bat
Run SSE_attach_metadata.bat