I Installed MS SQL 2008 R2 Express And Plesk 11 MS SQL Hostname is ".\MSSQLSERVER2008" Right Now !
I Want Change it to "localhost"
Can U Help Me ?
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That's not the host name, it's the instance name.
So to explain further, what you've got there is a connection string with the following format
For more information on instance names, take a look at this question and answer. If you still want to change the instance name, as far as I know there is no reliable method of doing so without re-installing and picking the right name during the installation process, as discussed in this question and answer on our sister site for database admins.