ok, i will trie to use this tool to see the SPN.

I have made the query below in the query window and the result returned was:

select auth_scheme from sys.dm_exec_connections...

I have configutared using CM. for SQL Server 2005

For SQL Server 2000 i dind't because the services of this named instance are not in the CM

If i have 2 diferente instances (one default instance and one named instance )on the same computer, can i use the same domain account for all the services of this...

An it don't let my install , or i can install the RTM version and them make the imediate update so that the SQL funcions?

If i undestud, in this OSs...

Ok i undestud.

just have a question about one of your anwsers:

"No - If you are on Vista or Windows Server 2008, you have to upgrade to a later service pack....

Ok, i understud.

What about if i didn't had any SPs installed yet on my SQL Server 2005 developer edition with vista OS? by default the builtin\administrators have sysadmin permissions when...

SQL Server 2000 is now resolved....

I installed SP4 on the box and it fixed.

(i had no SP)

But i still have a big problem.

I want to put the SQL Server 2005...

ok. If i understud there are where released 4 new CUs after SP3 was relesed.

I understud that i only need to install it if necessary, but what is a CU?

thank...