Dual boot Windows 8 and Fedora 17 - Windows wont shutdown

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http://forums.fedoraforum.org – Hello! I have Windows 8 Enterprise Evaluation and Fedora 17, both OS are 64 bit, on dual boot. Windows and Fedora work OK, with one problem - i can not shotdown computer from Windows. When i hit Shutdown, computer begin shutdown, but there is no shutdown, only return me on windows login screen. Restart is OK, shutdown from Fedora also OK. This problem only appears on dual boot Win8 - Fedora 17, on dual boot with other distros windows shutdown normaly, also dual boot Fedora - Win7. Bootloader is installed on dev/sda(where is windows installed) (HowTos)