visual studio 2010安装.net 4.0时总是失败？

如题，以前在装上VS2008的时候装过这个ISO安装包，可以安装，并且正常使用，没有出现过问题。可现在单独安装怎么也安装不上了，原因每次都是因为安装.net 4.0失败！

这是错误日志中的部分：

[06/24/10,08:48:31] Microsoft .NET Framework 4: [2] CGenericComponent::Install() expects the setup file for Microsoft .NET Framework 4, but the file failed verification.
[06/24/10,08:48:31] setup.exe: [2] ISetupComponent::Pre/Post/Install() failed in ISetupManager::InternalInstallManager() with HRESULT -2147467259.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft .NET Framework 4 is not installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft .NET Framework 4 简体中文语言包 was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft Visual F# 2.0 Runtime was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft Visual Studio Macro Tools was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft Visual Studio Macro Tools CHS 语言包 was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates TFS 对象模型(x86) was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates .NET Framework 4 Multi-Targeting Pack was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft Visual Studio 2010 Ultimate - CHS was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft Web 部署工具(x86) was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft ASP.NET MVC 2 - Visual Studio 2010 工具 was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft ASP.NET MVC 2 - Visual Studio 2010 工具语言包 - 简体中文 was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft ASP.NET MVC 2 was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft ASP.NET MVC 2 语言包 - 简体中文 was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft Silverlight was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft Silverlight 3 SDK was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft Visual Studio 2010 Tools for Office Runtime (x86) was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft Office 开发人员工具(x86) was not attempted to be installed.
[06/24/10,08:48:31] VS70pgui: [2] DepCheck indicates Microsoft Office 开发人员工具(x86)语言包 - 简体中文 was not attempted to be installed.

高手帮下忙，小弟感谢了。

谢谢各位的回答...

问题找到了，是因为ISO里德.NET4.0文件受损造成的，然而整个ISO文件却没有受损，我也不清楚到底是怎么回事，之前能够正常安装，并刻了光盘，现在用光盘安装，一切正常，希望对有此问题的朋友有所帮助，当频繁出现，安装.NET4.0时频繁出现错误，导致安装失败，可以考虑是安装文件出问题的后果。

注册表中重复了，因为你装第一次时注册表中就已注册了该软件，你去注册表中把它删了试试.....
在不行就重装系统吧！ 我们也经常这样的，呵呵

还是所"ISO"全部解压出来再安装,不解压安装可有会失败,必竟几个G的大软件. 另外就是(硬件要求是否合格). 要不先下载Microsoft .NET Framework 3.5 4先安装.

如以上回答内容为低俗、色情、不良、暴力、侵权、涉及违法等信息，可以点下面链接进行举报！

点此我要举报以上问答信息