silverlight debug时，出现cannot locate microsoft internet Explorer.

这一般就是由于注册表中ie的项丢失。在网络上淘到了解决方案，清晰明了。

步骤：

1.打开注册表，找到 HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths，发现iexplore.exe这个键丢失

2. 添加iexplore.exe这项

3. 改变(Default) REG_SZ 的值为  C:\Program Files\Internet Explorer\iexplore.exe 

4. 新加 REG_SZ 值，设置其 Path 为 C:\Program Files\Internet Explorer

5. 重启visual studio

 

原文：

 http://forums.silverlight.net/forums/p/82674/437438.aspx#437438 

Navigating to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths I found that theiexplore.exe key was missing. So here's what I did:

1. Added the iexplore.exe key to the  registry.
2. Changed the (Default) REG_SZ value to C:\Program Files\Internet Explorer\iexplore.exe 
   
3. Added a new REG_SZ value called Path and set it to C:\Program Files\Internet Explorer
4. Restarted my Visual Studio.