You need these: Install the Windows 7 Version of Debugging Tools for Windows
There are certain rare circumstances in which you might need to download the Windows 7 version of Debugging Tools for Windows. For example, if you need SOS.dll for version 1 of the .NET Framework, you can get it from the Windows 7 version of the tools but not from the Windows 8 version. The Windows 7 version of Debugging Tools for Windows is included in the Microsoft Windows SDK for Windows 7. Note
: When you install the Windows SDK, but sure to select Debugging Tools
in the installation wizard. Windows Symbol Packages
When applications, libraries, or drivers are linked, the linker that creates the .exe, .sys, and .dll files also creates a number of additional files known as symbol files. Symbol files hold a variety of data which are not actually needed when running the binaries, but which could be very useful in the debugging process. In most debugging scenarios, you can get symbols as needed from Microsoft’s symbol server, and you do not need to download an entire symbol package. However, in some scenarios, you might want to download the entire set of symbols for a particular version of Windows.
If you want the entire set of symbols for Windows Server 2012 RC, Windows 8 Release Preview, Windows Server 2008 R2, Windows 7, Windows Server 2008, Windows Vista, Windows Server 2003, Windows XP, or Windows 2000, then you can download a symbol package and install it on your computer.
On the Symbol Packages link, download the symbols for any Windows version you want to be able to debug. This one for sure: Download Windows Symbol Packages
Windows 8 and Windows Server 2012 Windows 7 and Windows Server 2008 R2
Windows 8 Release Preview and Windows Server 2012 Release Candidate
Windows 8 Consumer Preview and Windows Server 8 Beta
Windows 8 Developer Preview and Windows Server Developer Preview
Windows 7 Service Pack 1 Symbols
These packages contain the full set of symbols required to debug the Windows 7 Service Pack 1. Note:
These packages also contain the full set of symbols required to debug Windows Server 2008 R2 Service Pack 1.