Team Foundation Server December 2005 CTP Errors

I'm trying to install the TFS Dec2005 CTP (both tiers on the same machine) and I receive the same error every time.. the problem is that i think it might be an error from the scripts included in the setup program.

I have tried all the things that i've found on the forums.

The configuration:

Windows Server 2003 SP1, Active Domain, IIS 6, WSS 2.0, SQL2005 Enterprise, all required ports available, all the required users with elevated priviledges (can login as service, SQL Access as sysAdmin, etc)... (I won't write all things i've tried as it makes no sense and i'm sure i have all the things)

I will paste some info on the error here:

In the event log:

Product: Microsoft Visual Studio 2005 Team Foundation Server - ENU -- The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 26204. The arguments are: -2147217900, Must declare the scalar variable "@fileName"., TeamBuildDBSetup

In the setup log Must declare the scalar variable "@fileName" is the only thing that doesn't let the setup to continue.. The error seems to be in the Data Tier Setup.. as it is not able to create the databases..

here is the first error from the MSI log:

MSI (s) (E0:F8) [16:12:19:546]: Invoking remote custom action. DLL: C:\WINDOWS\Installer\MSI23A.tmp, Entrypoint: ExecuteSqlStrings
ExecuteSqlStrings: Error 0x80040e14: failed to execute SQL string but continuing, error: Must declare the scalar variable "@dbuser"., SQL key: BisCreateSchema SQL string: CREATE PROCEDURE prc_EnableDBUser
@dbUser SYSNAME
WITH ENCRYPTION
AS

and a random error from the same log (that repeats almost every time):

ExecuteSqlStrings: Error 0x80040e14: failed to execute SQL string but continuing, error: Must declare the scalar variable "@fileName"., SQL key: BisCreateSchema SQL string: DECLARE @sql NVARCHAR(1024)
DECLARE @filename SYSNAME

And the user logon error from the Setup Log... what's weird is that this error doesn't appear in the "Security Audit" Events...

[12/20/05,11:54:52] VSServerUI: The following Logon Error was ignored: 1385: Logon failure: the user has not been granted the requested logon type at this computer.

Maybe I'm missing something... i don't know.. I've tried everything

If i'm bull-@#$ing please let me know

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