I have Windows 7 Home edition SP1 installed on my system, and downloaded SQL Server 2008 R2 Management Studio and got it installed. But when I try to connect via .\\SQLEXPRESS,
You need to start the SQL Server manually. Press
windows + R
type
sqlservermanager12.msc
right click ->Start
Service configuration does not display SQL Server?
downloaded Sql server management 2008 r2 and got it installed. Its getting installed but when I try to connect it via .\SQLEXPRESS it shows error. DO I need to install any SQL service on my system?
You installed management studio which is just a management interface to SQL Server. If you didn't (which is what it seems like) already have SQL Server installed, you'll need to install it in order to have it on your system and use it.
http://www.microsoft.com/en-us/download/details.aspx?id=1695