c# - .Net 4.5 System dlls are missing after installing windows8 SDK and restart -


i working on mvc3 project in visual studio 2012 targeting 4.5. right until installed windows8 sdk developing apps windows8 last night.after restarting computer, mvc3 projects have missing dlls.if reference 4.0 version fine again missing classes , have changed targeting .net version 4.0 not want @ moment. enter image description here

this picture showing missing dlls.i tried find in c:\program files (x86)\reference assemblies/microsoft... not find 4.5 missing dll. os: windows 7

update:

now have found 4.5 dlls in c:\program files (x86)\reference assemblies\microsoft\framework.netcore\v4.5 problem every visual studio project template.there aslo problem, system.linq have refrenced using system.linq not recognize namespace.can suggest me tool or fix /update patch ?

update 2: visual studio removal , re installation didn't ,it still showing warning errors on dlls.


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