zmazal si voľbu inštalácia a namiesto toho zmazalo voľbu windows 8 ?
http://www.tweakhound.com/2012/11/13/how-to-fix-th e-windows-bootloader/
http://peter.upfold.org.uk/blog/2013/02/28/restore -windows-8-bootloader/
http://www.techspot.com/guides/630-windows-8-boot- fix/