这次安装了VB2005，.Net是2.0版本了，而通过自动安装， AutoCAD2006需要升级系统，安装.NET Framework Runtime，而系统已经安装了更高版本，安装程序没有这个判断功能，怎么办？Framework可定时向下兼容的，看来需要跳过默认安装程序，直接安装了。
先看看安装错误提示，位于C:/Documents and Settings/Administrator/Local Settings/Temp，如下：
[11/10/2006 11:07:54] === Installation started on ADMIN by Administrator ===
[11/10/2006 11:07:56] [Info] Windows Installer upgrade is not required
[11/10/2006 11:07:56] System Version = 3.1.4000.2435
[11/10/2006 11:07:56] Installation skipped: MSI Runtime 3.0
[11/10/2006 11:07:56] [Info] .NET Framework Runtime upgrade is not required
[11/10/2006 11:07:56] System Version = 2.0.50727.42
[11/10/2006 11:07:56] Installation skipped: .NET Framework Runtime 1.1
[11/10/2006 11:07:56] Installation started: .NET Framework Runtime 1.1 Language Pack
[11/10/2006 11:07:56] Command = "support/dotnetfx/chs/langpack.exe" /q:a /c:"inst /qb"
[11/10/2006 11:07:56] [Error: 1603] 安装时发生严重错误
[11/10/2006 11:07:56] Installation failed: .NET Framework Runtime 1.1 Language Pack
[11/10/2006 11:07:56] Installation aborted
[11/10/2006 11:07:58] === Installation ended ===
可以进入I:/Bin/acadFeui，盘符I随系统不同，就是AutoCAD2006安装文件所在盘符，直接运行“acad.exe”就可以安装了，而不需要再安装.NET Framework Runtime。