Getting strange errors while installing visual studio 2015 rc community

I have windows 7 x64 on my laptop, a few days ago I tried to install visual studio 2015 community rc, but I get the current error when the installer tries to install ".NET Framework 4.6 rc":

Microsoft .NET framework 4.6 rc
Fatal error during installation.

Visual c++ library Redist resource package
Package failed. 

      

        
        
        
      

    

And the last lines in the installation log files:

[189C:1670][2015-06-10T18:20:08]i000: MUX:  Go to Finished page.
[189C:1670][2015-06-10T18:20:08]i000: MUX:  Format Message Failed: 317
[189C:1670][2015-06-10T18:20:08]i000: MUX:  Format Message Failed: 317
[189C:1670][2015-06-10T18:20:08]i399: Apply complete, result: 0xc0000421,     restart: None, ba requested restart:  No

      

        
        
        
      

    

I download ".NET framework 4.6 rc" and try to install it from visual studio, but this time I get this problem:

1.he setup cannot run in compatibility mode.
2.The .NET Framework 4.6 redistributable does not apply to this operating system. Please download the .NET Framework 4.6 for your operating system from the <A HREF="http://go.microsoft.com/fwlink/?LinkId=513370">Microsoft Download Center.

      

        
        
        
      

    

But the downloaded package is for windows 7 and windows 8 and my windows are 7 editions.

And I have a problem in my windows and I don't know how to solve this problem, sometimes when I want to install new apps like firefox, the installer app exits automatically without any error messages. You know there are packages like sql server express, .NET Framework 4.6 rc and others in Visual Studio iso file, when I try to install these packages manually with their .msi files the installer crashed and exited without any message ...