Windows 7 Bootmgr compressed on MBP Retina

I compressed my Bootcamp partition while using Windows 7 (idiot ).
Now I can't boot Windows 7 anymore, because of getting the "Bootmgr is compressed" error.
I have read that this can be easily fixed with the Windows 7 installation disc.
Unfortunately the MBP Retina doesn't have an optical drive. I did the Windows installation by using an USB stick.
My question is: How can I boot the Windows Repair environment from the USB Stick to get the Bootmgr fixed?
Can I also use the "Windows 7 repair disc" files, copied on a USB Stick, to get this fixed?
Thanks for your help.

No answer for this problem?

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