SQL server 2008 Express x64 in windows 8.1 fail I've been download sql server express x64 version in this

I just install new windows 8.1 x64 vl version and install trial KIS for anti-virus. After i install sql server but it's not working 



and



i uninstall KIS, SQL server and install avast and sql server again but the same :(.

How to fix that thanks.
You're attempting to use "SQLExpress" as a server name.  I'm guessing that's the instance name.  Connect to ".\SQLExpress" instead.