Problem in installing SQL Express getting error message that already instance id is in use

Hi All,

I am new to SQL Server.

I have installed VS2012 trial version. Due to some other reasons i have uninstalled VS2012 and installed again. 

I tried to create a database from Server Eplorer in VS but there is no server instance is available. While installing i have chosen to install SQL Server.

But, it is not showing in drop menu while creating database.

I checked serivices, SQL and Agent services are not running giving error message 1067 and 1068 when i try to start them.

I have downloaded SQL Express edition and tried to install newly. but, getting error message that Instance ID is already in use. 

Even i have tried to installed adding to existing instance of SQLEXPRESS. still not working.

I fed up with trying all options. I physically deleted all the folders from Program Files and tried to install new SQLEXPRESS.

but, still getting the same error message "Instance id in use". 

When i run Discovery Report. it showing two instance ids as shown below.

Can someone guide me that how i can completely delete all the information to SQL Server and install freshly?

Thanks,

Ramana