ASROCK Fatal1ty Z77 Professional-M Instructiontion page 245

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 hotfix 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 hotfix then reboot by itself.
E. Please start to install motherboard drivers and utilities.
6. Finish.
Fatal1ty Z77 Professional-M Series Motherboard
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7 64-bit, install the hotfix kb2505454.
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