Python for VS 2012 Installation Issue

Installed IronPython for VS 2012 by PTVS, seems ok but in fact not working: 1) cannot find python in New Project other language list 2) VS 2012 crash when click Python Tool-> Fresh DB ‘devenv.exe’ (Managed (v4.0.30319)): Loaded ‘C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.Debugger.Interop.10.0\10.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Debugger.Interop.10.0.dll’ ‘devenv.exe’ (Managed (v4.0.30319)): Loaded ‘C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Microsoft.VisualStudio.Language.Intellisense\v4.0_11.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Language.Intellisense.dll’ An unhandled exception of type ‘System.InvalidOperationException’ …