After open my project in visual studio 2013, I have several errors, regarding Microsoft.VisualStudio.Web.Host.exe component.
Event data from event viewer
Microsoft.VisualStudio.Web.Host.exe
12.0.21005.1
524fa105
ntdll.dll
6.1.7601.18939
55afd843
c0000005
00039dde
2a24
01d0da7d260d9944
C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\Microsoft.VisualStudio.Web.Host.exe
C:\Windows\SysWOW64\ntdll.dll
63da8de8-4670-11e5-8a9c-0019999f62f2
I found this in ActivityLog.xml
771 2015/08/19 12:46:04.829 Error Extension Manager Extension will not be loaded because an extension with the same ID 'Microsoft.Windows.DevelopmentKit.Desktop' is already loaded at C:\PROGRAM FILES (X86)\COMMON FILES\MICROSOFT\EXTENSIONMANAGER\EXTENSIONS\MICROSOFT\WINDOWS KITS\8.0\DESKTOP SDK... C:\PROGRAM FILES (X86)\COMMON FILES\MICROSOFT\EXTENSIONMANAGER\EXTENSIONS\MICROSOFT\WINDOWS KITS\8.1\DESKTOP SDK\
VS version is
Microsoft Visual Studio Ultimate 2013 Versione 12.0.40629.00 Update 5 Microsoft .NET Framework Versione 4.6.00081
My OS is Windows 7 Pro x64, SP1