CAS Policy Manager error when installing Server SQL express 2012

Question

Hello everyone,
I was wondering if anyong can help me with this.
I am trying to install SQL server express 2012 on a windows 7 computer and am unable to install it.
When I try to start the installer I get the error "Microsoft .NET Framework CAS Policy Manager has stopped working"
Problem signature:
  Problem Event Name: APPCRASH
  Application Name: caspol.exe
  Application Version: 2.0.50727.5420
  Application Timestamp: 4ca2b8df
  Fault Module Name: ntdll.dll
  Fault Module Version: 6.1.7601.18247
  Fault Module Timestamp: 521eaf24
  Exception Code: c0000005
  Exception Offset: 0000000000027689
  OS Version: 6.1.7601.2.1.0.256.1
  Locale ID: 1033
  Additional Information 1: 00a4
  Additional Information 2: 00a4a2975d5a28cfbbc1bf906fc7eacd
  Additional Information 3: 0146
  Additional Information 4: 0146abaed829ebf2f677c0e9088e54ea
And after I hit close program on that I get the error:
CasPol.exe - Application Error
The application was unable to start correctly (0x0000005). Click OK to close the application.
And I have tried redownloading it multiple times.
I have run the .net cleanup tool and a repair tool
I have uninstalled and reinstalled .net as well to the lastest version.
With no luck at all.
Any suggestions on what I might be able to do to fix this?
An help would be greatly appreciated.

Answer 1

Hello,
It points to fact that your .Net Framework is corrupt.Use below tool to repair .Net framework
.Net framework repair tool
Additional helpful articles to refer
CAS policy error message
CAS policy error message when
installing SQL server
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