Fiddler 2 won't launch

I try to start fiddler 2 开发者_StackOverflow中文版and I get this message box:

Fiddler 2 startup aborted

Fiddler appears to be running in this users account

Maybe in a terminals services session

I loaded fiddler onto another machine on our wireless network and it displays the same message. How do I fix this so I can run fiddler normally?

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Do you see the problem with the latest version? https://www.fiddler2.com/dl/fiddler2alphasetup.exe