请CAD高手解决

装CAD2006时出现：

[12/28/2007 16:13:35] === Installation started on HT-53DD98B8F4C4 by ht ===
[12/28/2007 16:13:36] [Info] Windows Installer upgrade is not required
[12/28/2007 16:13:36] System Version = 3.1.4000.2435
[12/28/2007 16:13:36] Installation skipped: MSI Runtime 3.0
[12/28/2007 16:13:36] [Info] .NET Framework Runtime upgrade is not required
[12/28/2007 16:13:36] System Version = 2.0.50727.42
[12/28/2007 16:13:36] Installation skipped: .NET Framework Runtime 1.1
[12/28/2007 16:13:36] Installation started: .NET Framework Runtime 1.1 Language Pack
[12/28/2007 16:13:36] Command = "supportdotnetfxchslangpack.exe" /q:a /c:"inst /qb"
[12/28/2007 16:13:40] [Error: 1603] 安装时发生严重错误
[12/28/2007 16:13:40] Installation failed: .NET Framework Runtime 1.1 Language Pack
[12/28/2007 16:13:40] Installation aborted
[12/28/2007 16:13:45] === Installation ended ===