Login Error

Please help me. I am already stuck here. This error occurred when I open the system.


An error[-2147217843] occurred in Microsoft OLE DB Provider for ODBC Driver while processing Main(). [Microsoft][ODBC SQL Server Driver][SQL Server]Login failed for user 'Admin'.

Please contact your SYSTEM ADMINISTRATOR.

I am using MS SQL Server 2005.

Hope someone can help me. :(

I'm just guessing here because I have never used SQL Server and thus don't know how it works. However by the looks of that error it is saying that the user "Admin" does not exist (in the database).