SQL 2005 Express Local Admin Access Denied

I am using a standard installation of SQL 2005 Express installed with Visual C# Express. I have tried several connection strings, have tried connecting different databases, all of which end up giving me access denied for user <machineName>Greg (Greg is the local admin account for this PC. I found this guideline for connectivity questions (http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=362498&SiteID=1), and have gone through it all, posting the answers to questions here. One thing that may be different about this machine is that it is a tablet PC (WinXP Tablet edition) and I am running VMWare Server. I also tried loading it on a WinXP Pro workstation with no VMWare, and have gotten the same results. Any help will be greatly appreciated.

My connection string:
@"Server=(local);Integrated Security=SSPI;Database=Database1");

Client error message:
Cannot open database "Database1" requested by the login. The login failed. Login failed for user 'GREGBORGGreg'.

Client is local to the SQL 2005 Express - this is an application running on a local PC.

I am able to ping -a GREGBORG (as well as localhost)

I am able to telnet to port 1433 of my local machine, although Ctrl+[ does not give me an SQL prompt

I am using ADO.NET 2.0 and Visual C# 2005 Express

I have enabled Shared memory, named pipes and TCP/IP.

I have no alias' configured, and am not requiring encryption.

=========================
I am using SQL 2005 Express loaded on Windows XP tablet edition.

The SQL browser is not enabled, and it says that it has no enabled devices associated with it.

SQL Server is running under the Network System account

I have tried running it firewalled and not firewalled

I am running Clamwin anti-virus


From the ERRORLOG:
2007-01-03 12:29:56.19 Logon Error: 18456, Severity: 14, State: 16.
2007-01-03 12:29:56.19 Logon Login failed for user 'GREGBORGGreg'. [CLIENT: 10.101.1.200]

From the command prompt I get:
C:Documents and SettingsGreg>osql -E -S (local)sqlexpress
1> use Database1
2> go
Msg 911, Level 16, State 1, Server GREGBORGSQLEXPRESS, Line 1
Could not locate entry in sysdatabases for database 'Database1'. No entry found
with that name. Make sure that the name is entered correctly.

When I try to attach Database1 in my 'My Documents' folder, it says that access is denied to the file.


I added a user via SQL Management Studio Express and then received the error:

C:Documents and SettingsGreg>osql -S gregborgsqlexpress -U Greg -P ********
1> sp_attach_db "Database1", "C:documents and SettingsGregMy DocumentsVisual
Studio 2005Projects est_SQL est_SQLDatabase1.mdf"
2> go
Msg 5133, Level 16, State 1, Server GREGBORGSQLEXPRESS, Line 1
Directory lookup for the file "C:documents and SettingsGregMy
DocumentsVisual Studio 2005Projects est_SQL est_SQLDatabase1.mdf" failed
with the operating system error 5(Access is denied.).
1> use northwind
2> go
Msg 945, Level 14, State 2, Server GREGBORGSQLEXPRESS, Line 1
Database 'Northwind' cannot be opened due to inaccessible files or insufficient
memory or disk space. See the SQL Server errorlog for details.

In the ERRORLOG I have:
2007-01-03 12:38:27.25 spid51 Error: 5173, Severity: 16, State: 1.
2007-01-03 12:38:27.25 spid51 One or more files do not match the primary file of the database. If you are attempting to attach a database, retry the operation with the correct files. If this is an existing database, the file may be corrupted and should be restored from a backup.
2007-01-03 13:07:16.82 spid51 Using 'xpstar90.dll' version '2005.90.1399' to execute extended stored procedure 'xp_instance_regread'. This is an informational message only; no user action is required.
2007-01-03 13:09:24.68 Logon Error: 18456, Severity: 14, State: 8.
2007-01-03 13:09:24.68 Logon Login failed for user 'Greg'. [CLIENT: <local machine>]
2007-01-03 13:09:27.43 Logon Error: 18456, Severity: 14, State: 8.
2007-01-03 13:09:27.43 Logon Login failed for user 'Greg'. [CLIENT: <local machine>]


Again, thank you for any help. I think I may have been staring at this too long to be productive any more...
--Greg