when I open project through Visual Studio 2010,it shows that I need .net framework 4.0 :
But when I install .net framework 4.0,shows it is already installed :
*translation above:
- Microsoft .NET Framework 4 is already included in this operating system. You do not need to install the .NET Framework 4 redistributable.
- .NET Framework 4 (included) and above is already installed on this computer.
how can I fix this? very thanks!