安裝Microsoft Silverlight Tools Beta 1 for Visual Studio 2008的時候又出了問題，點擊silverlight_chainer.exe 仍然是那個變態的對話框，不讓你點下一步，給出提示：
(An Error Has Occurred:
Silverlight Tools cannot be installed because one or more of the following conditions is true:
1. Visual Studio 2008 RTM is not installed.（沒有VS2008誰裝Silverlight Tools for VS2008 ）
2. The Web Authoring feature of Visual Studio is not installed.（很少用到這個）
3. A previous version of the Silverlight Runtime is installed.(默認的卸載程序會留下痕跡)
4. A previous version of the Silverlight SDK is installed..(這個問題上次說過了)
5. The Visual Studio Update KB949325 is installed.（ 不知道KB949325 是什麼更新）
6. A previous version of Silverlight Tools is installed. (For Vs2005的一般不會干擾，等於是廢話，除非微軟分不清楚Visual studio版本上的8和9)
To continue, please install or uninstall the appropriate products and run this installer again.)
Silverlight Tools cannot be installed because one or more of the following conditions is true:
1. Visual Studio 2008 RTM is not installed.（沒有VS2008誰裝Silverlight Tools for VS2008 ）
2. The Web Authoring feature of Visual Studio is not installed.（很少用到這個）
3. A previous version of the Silverlight Runtime is installed.(默認的卸載程序會留下痕跡)
4. A previous version of the Silverlight SDK is installed..(這個問題上次說過了)
5. The Visual Studio Update KB949325 is installed.（ 不知道KB949325 是什麼更新）
6. A previous version of Silverlight Tools is installed. (For Vs2005的一般不會干擾，等於是廢話，除非微軟分不清楚Visual studio版本上的8和9)
To continue, please install or uninstall the appropriate products and run this installer again.)
，無奈就自己分析，搜索文件，所有系統相關文件夾下的帶silverlight的全部刪除，×:/Program files下搜到帶silverlight的刪除，註冊表中搜索到：
“HKLM\SOFTWARE\Microsoft\VisualStudio\9.0\ToolboxPages\Silverlight Components”這個鍵值刪除，點擊silverlight_chainer.exe順利完成安裝。