Hans,
That sounds like the same error that Marius M was having. It was due to a couple of missing {objectQualifier} tokens in the primary and foreign key constraint object names in the 05.00.00.SqlDataProvider script. I fixed it and uploaded refreshed install and source packages to CodePlex on May 26th.
Could you verify that you downloaded the package you tried to install after May 26th and if so, take a look at the created date of the DotNetNuke.Modules.Feedback.dll in the \bin folder. It should be Wednesday, May 26, 2010, 5:32:32 PM. Also look at the first portion of the 05.00.00.SqlDataProvider script to confirm that it reads as follows:
ALTER TABLE {databaseOwner}{objectQualifier}Modules SET (LOCK_ESCALATION = TABLE)
GO
ALTER TABLE {databaseOwner}{objectQualifier}Feedback
DROP CONSTRAINT PK_{objectQualifier}Feedback
GO
ALTER TABLE {databaseOwner}{objectQualifier}Feedback
ADD CONSTRAINT
PK_{objectQualifier}Feedback PRIMARY KEY CLUSTERED
(
FeedbackID
) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF,
ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
ALTER TABLE {databaseOwner}{objectQualifier}Feedback WITH NOCHECK ADD CONSTRAINT
FK_{objectQualifier}Feedback_{objectQualifier}Modules FOREIGN KEY
(
ModuleID
) REFERENCES {databaseOwner}{objectQualifier}Modules
(
ModuleID
) ON UPDATE NO ACTION
ON DELETE CASCADE
NOT FOR REPLICATION
GO
If the created date and SqlDataProvider script matches, please confirm that you are running SQL Server 2005 in compatibility mode = 90 rather than 80 for the DNN installation's database.
Thanks!