ASROCK Z77 Pro3 Manual De Instrucciones página 192

c. Set "Startup type" to "Disable" then Click "OK".
C. Reboot your system.
D. After reboot, please start to install motherboard drivers and utilities.
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Windows 7 64-bit:
A. Please request the hotfi x KB2505454 through this link:
http://support.microsoft.com/kb/2505454/
B. After installing Windows
(This may take a long time; >30 mins.)
C. Reboot your system. (It may take about 5 minutes to reboot.)
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D. Windows will install this hotfi x then reboot by itself.
E. Please start to install motherboard drivers and utilities.
6. Finish.
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7 64-bit, install the hotfi x kb2505454.
ASRock Z77 Pro3 Motherboard