Windows 8 installation problem, please help..

I tried to install windows 8 (legal) on my 5/2012 Macbook Air using Bootcamp. Everything was ok since I entered the disc-choosing part. On "bootcamp partition" the installation program says "unable to install windows to this partition because of missing drivers, try to enter Bios". When I restart the computer, only the Windows logo is able to be seen and thats all, now it´s impossible to even enter the Windows installation programme. But, when I disconnect my flash disc containing W8, Mac is still booting W8 installation saying "No bootable media found". Is there any possibilty to enter my MacOS, system choice, or at least to download new MacOS and format the disc?
Thank you so much....

@filisipi: I am not sure if I understood your problem correct. Holding down the "Alt"-Key after turning on the power of your MBA should give you the joice between all operating systems recognized at this point in time. This should provide the way to boot again with Mac OS.

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