我有一个愚蠢的问题，这简直在任何明显的方式没有得到解决。问题的关键是，我的两个好老MSVS 2010和最新的MSVS 2012看不见第4版或4.5 .NET框架。这些库都应该是自动与Visual Studio安装的，所以它会使用相关的C＃（而不是只）拥有的任何时间。

不过，我已经试过重新安装IDE几次 - 不，试图创建一个新项目时只有2,3和3.5框架的版本可供选择。也可以打开最新的.NET版本的任何外部创建的项目。在不同的硬盘驱动器重新安装IDE，手动框架重新安装等并没有带来成功。 IDE的是旗舰版两种。

我非常希望解决的问题，而不会尝试重新安装我的Windows 7家庭普通版。任何人都可以，请给我一些好建议呢？

P.S。 几乎相同 解决方案

尝试安装.NET 4 Multitargeting包：

多目标包的Microsoft .NET Framework 4.0.2 （KB2544526）

多目标包的Microsoft .NET Framework 4.0.3 （KB2600213）

I've got a stupid problem, which just couldn't get solved in any obvious way. The point is, that both my good old MSVS 2010 and latest MSVS 2012 "can't see" .NET Frameworks of version 4 or 4.5. These libraries are supposed to be automatically installed with the Visual Studio, so that it would use relevant C# (and not only) features any time.

But I've tried reinstalling the IDE several times - no, only 2,3 and 3.5 framework versions are available when trying to create a new project. Nor any externally created project for latest .NET versions can be opened. Reinstalling IDE on different hard drives, manual framework reinstalling and so on didn't bring success. IDE's are Ultimate Edition both.

I badly wish to solve the problem without attempting to reinstall my windows 7 home basic. Could anyone, please, give me some good piece of advice about it?

P.S. Almost similar problem

Try to install the .NET 4 Multitargeting Pack:

Multi-Targeting Pack for Microsoft .NET Framework 4.0.2 (KB2544526)

Multi-Targeting Pack for Microsoft .NET Framework 4.0.3 (KB2600213)