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Hi I am trying to create a bootable USB for Windows 7 (I have superdrive removed). I went the rEFIt + Microsoft Bootable USB Tool route and keep getting "Operating System Not Found".

I also checked the USB in Disk Utils and it shows as MBR.

USB also shows up if I press "Alt" when booting, but same "Operating system..." error.

How can I fix this?

Spent half a day already...

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From the fact that you say "I have superdrive removed" I'm guessing you're using a Mac, but that isn't clear from your post. Are you? –  Daniel May 20 '12 at 23:10
Yes I am, Macbook Pro.. –  Stpn May 20 '12 at 23:12
Do you know if your USB of Windows 7 (install DVD?) works? Have you successfully used it on another computer? Or is the question about your bootable USB? –  irrational John May 20 '12 at 23:47
I used it before, in my superdrive days... –  Stpn May 20 '12 at 23:48
Used the DVD to boot via the superdrive or this USB with Windows 7? –  irrational John May 20 '12 at 23:51

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