This happens when the .NET framework installation is corrupt.


Solution:

1) Try to fix the problem using the Microsoft solutions:

http://social.technet.microsoft.com/Forums/de-DE/5e3357ae-4691-452b-a152-88bd8bbfa937/cas-policy-manager-error-when-installing-server-sql-express-2012?forum=sqlexpress
http://answers.microsoft.com/en-us/windows/forum/windows_vista-hardware/microsoft-net-framework-cas-policy-manager-error/dcf301f0-92e0-4faa-8bf2-95d33c828d97

2) deinstall SQL Server

3) deinstall ADOit:CE

4) then reinstall ADOit:CE which inlcudes SQL Server


As the CAS error is now fixed, it should work then