Problems after changing the security model to Standard

Hello to everyone.

I have the following problem.

I wanted to change the security model for a 5.0 SP1 Database from Enhanced to Standard, since I’ve read

that using this model there will be less the problems of syncronization .

Everything went well until I’ve tried to use Windows Login.

I got the error: The user and password are invalid. Try again.

On the same server I have a copy of the same database with the Enhanced model and the same windows login works.

I’ve deleted the login and inserted again, on the Standard security model database. It did not worked.

With the database logins there is no problem. They work on both databases.

What is the problem? I cannot figure it out :(.

Thank you in advance.