问题描述：无法安装Fiddle，提示已有Fiddle，但是却找不到。
打开Fiddle，提示“Machine-wide Progress Telerik Fiddler installation has been found at ...Please, use that one or uninstall it ...”
解决：删除注册表后，重新安装就行了
"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Fiddler2"
"HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Fiddler2"