Please check the following.

Is the password for pubuser correct?

Does the pubuser has requisite permissions on the database?

Is the default database for pubuser is set correctly?

Looks like some of the components of SQL 2005 are already installed. Un-installing them may help.

Ref: http://social.msdn.microsoft.com/Forums/en-US/sqlsetupandupgrade/thread/3e11d3fe-e9ad-4b4e-bc79-b975f94dcc69

No problem. Nice to know that it was useful for you !

Restarting the SQL Services will resolve this issue temporarily. However in the long run you may want to check the memory requirements or consider increasing the mem_to_reserve value.

The memory allocation depends on the load that SQL Server is going to handle. This article[/url] explains it better.

You may find these articles useful.

http://www.sql-server-tool.com/compare-two-tables.htm

http://weblogs.sqlteam.com/jeffs/archive/2007/05/02/60194.aspx

You created one more database? I did not get the question

Check if DSQUERY GROUP returns the same results as xp_logininfo?

That is a good approach. You may use this query to check for the fragmentation of the tables.

select object_name ( object_id ) as [Table Name] , index_id , avg_fragmentation_in_percent from...

The answer was available in the Hyperlink I provided in the previous post. You may query the default trace as per your requirement. However, I have given the below example.

select...

Both the links that I provided have "How to" do it information on Importing a custom DLL. If they are not useful then I might have misread the requirement.

You may want to go through the Default Trace of SQL 2005. This article[/url] explains on how to do it.

You may safely move that folder to some other location. In SQL Server 2000, there was a dependency on this folder, since it used to store the Outlook configuration used...

Is there any information in the Application/System Event Log when this exception occurs?

What does the four part query (ServerName.DatabaseName.OwnerName.ObjectName) return?

Does it throw any error?