問題描述：無法安裝Fiddle，提示已有Fiddle，但是卻找不到。
打開Fiddle，提示“Machine-wide Progress Telerik Fiddler installation has been found at ...Please, use that one or uninstall it ...”
解決：刪除注冊表后，重新安裝就行了
"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Fiddler2"
"HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Fiddler2"