I re-installed w7 ultimate and installed Microsoft® SQL Server 2008 R2.
Firstly, it was problem of permissions, because I had error log like this
User does not have permission to perform this action
That's why I tried this link:
SQL Server 2008 R2 Express permissions -- cannot create database or modify users
I logged in as 'sa' and granted permissions to my users.
I restarted SQL Server, restarted computer but no news.
Just error log changed:
This installation of SQL Server Agent is disabled. The edition of SQL Server that installed this service does not support SQL Server Agent.
Any ideas?