本文适用于Microsoft Visual Studio 2008的预发行版本(Tech Preview,Beta或者CTP)，关于Visual Studio 2005的卸载步骤，你可以查看《卸载Visual Studio 2005的早先版本》

Visual Studio 2008最好能被安装在一台没有任何预发行版本的Visual Studio 2008(代号“Orcas”)或相关组件。

如果你的电脑有预发行版本，在你开始安装新的版本之前必须卸载掉旧版本。我们推荐你运行Microsoft Visual Studio 2008的卸载程序进行卸载，不过有时候你需要卸载一些剩下的可选组件，在这儿我推荐你使用Windows Installer Clean Up卸载程序。

1.进入“添加/删除程序”。

2.卸载所有Visual Studio 2008的产品。

3.卸载下面任何还可能保留着的产品

Remove any remaining supporting products in the specified order.

Remove "MSDN Library for Visual Studio 2008 Beta"

Remove "Microsoft SQL Server Compact Edition 3.5"

Remove "Microsoft SQL Server Compact Edition 3.5 Design Tools"

Remove "Microsoft SQL Server Compact Edition 3.5 for Devices"

Remove "Microsoft Visual Studio Performance Collection Tools"

Remove "Windows Mobile 5.0 SDK R2 for Pocket PC"

Remove "Windows Mobile 5.0 SDK R2 for Smartphone"

Remove "Crystal Reports 2007"

Remove "Visual Studio Asset System"

Remove "Microsoft Visual Studio Web Authoring Component / Microsoft Web Designer Tools"

Remove "Microsoft Visual Studio 2005 Tools for the 2007 Microsoft Office System Runtime"

Remove "Microsoft Visual Studio 2005 Tools for the 2007 Microsoft Office System Runtime Language Pack" (non-English editions only)

Remove "Microsoft Visual Studio Tools for Office Runtime 3.0"

Remove "Microsoft Document Explorer"

Remove "Microsoft Document Explorer 2005 Language Pack" (non-English editions only)

Remove "Microsoft Device Emulator 3.0"

Remove "Microsoft .NET Compact Framework 3.5"

Remove "Microsoft .NET Compact Framework 2.0 SP1"

Remove ".NET Framework 2.0 SDK"

Remove "Microsoft Visual Studio Codename Orcas Remote Debugger"

Remove "Microsoft Visual Studio 64bit Prerequisites Beta" (64-bit platforms only)

Remove "Microsoft .NET Framework 3.5"

Install the Visual Studio 2008 edition you wish to use

http://www.itjewy.com/Content/blog/IT-102-visual-studio-2008.html看看