Could not create SSOSQL. To fix the problem, reinstall SSO or try 'regasm SSOSQL.dll' from a Visual Studio command prompt.Error Code: 0x80131700

You have installed BizTalk?

You have installed SQL server?

You have installed .NET4.0 ?

Everything is fine.

Then you reboot, or you restart SQL Server.

Enterprise Single Sign-on Does not want to start…. ???

It errors with:

Could not create SSOSQL. To fix the problem, reinstall SSO or try 'regasm SSOSQL.dll' from a Visual Studio command prompt.Error Code: 0x80131700

OR

Windows could not start the Enterprise Single Sign-On Service service on Local Computer.
Error 0x80131700: 0x80131700

OR you are getting:

Creation of Adapter FILE Configuration Store Entries failed.
An Error occurred while attempting to access the SSO database.

The problem is .NET 4 does something to break SSO.

This issue occurs after installing .NET Framework 4.0. The registration of the assembly used by ENTSSO to access SQL Server (SSOSQL.dll) does not specify the correct version of the .NET Framework. When .NET Framework 4.0 is installed, the assembly will try to use the newer framework and then fail to load

DO NOT do what it says in the event log it will NOT work fully.

The fix is: http://support.microsoft.com/kb/2252691

However you need to BE SURE you do it correctly.

Is your environment 64bit? Most are these days. Did you install 64bit SSO?

Is it in:

64bit: C:\Program Files\Common Files\Enterprise Single Sign-On
32Bit: C:\Program Files (x86)\Common Files\Enterprise Single Sign-On

If you have 64bit, follow the 64BIT instructions ONLY

1. Open a command window
2. Go to C:\Windows\Microsoft.NET\Framework64\v2.0.50727
3. Type each of the following and hit ENTER

32bit: regasm “C:\Program Files\Common Files\Enterprise Single Sign-On\win32\ssosql.dll”
64bit: regasm “C:\Program Files\Common Files\Enterprise Single Sign-On\ssosql.dll”

Note On a 64-bit server, regasm will need to be run for both the 32-bit and 64-bit versions of ssosql.dll.

Do both of these steps and you day will be brighter.