Am facut:

sp_dropserver 'DORUC\SQLEXPRESS'
go

sp_addserver 'DORU\SQLEXPRESS', local
go

exec sp_helpserver
go

si acum este corect: name = DORU\SQLEXPRESS

In Visual Studio Ecpress 2010 problema ramane. Orice baza de date pe care o creez cu "Add Item --> Service-based Database" are in fereastra Properties --> Owner = DORU-PC\Doru nu DORU\Doru. Am reinstalat VS Express 2010 si problema persista.

Multumesc.