SQL server 2012 is not installing.

Hi All,

Whenever I am trying to install SQL server 2012 in windows 7 professional 64 bit OS, I am getting one error message i.e. "Microsoft .NET Framework 3.5 Service Pack 1 is required".

I checked the check box from the control panel-->programs and features-->Turn windows features on or off.

After that I started again installing the same but still I am getting the same error message. Please help me to come out of this problem.

Thanks & Regards,

Rajesh