I installed Microsoft SQL Server 2008.
When I start SQL Server Management Studio (SSMS), I get the Connect to Server login window with a blank textbox f
I also had this problem first time.
In the Connect to Server dialog box, verify the default settings, and then click Connect. To connect, the Server name box must contain the name of the computer where SQL Server is installed. If the Database Engine is a named instance, the Server name box should also contain the instance name in the format: computer_name\instance_name.
So for example i solved the problem like this: I typed in the server name: Alex-PC\SQLEXPRESS
Then it should work. for more see http://technet.microsoft.com/en-us/library/25ffaea6-0eee-4169-8dd0-1da417c28fc6