If you have error creating project and receive Unable read project file [full filename]: The tools version "3.5" is unrecognised , then the following should help to solve it. Open up your Window registry :- And make the following changes.... [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild] [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\3.5] "DefaultToolsVersion"="2.0" [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ToolsVersions] [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ToolsVersions\2.0] "MSBuildToolsPath"="C:\\WINDOWS\\Microsoft.NET\\Framework\\v2.0.50727\\" [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ToolsVersions\3.5] "MSBuildToolsPath"="C:\\WINDOWS\\Microsoft.NET\\Framework\\v3.5\\"