ASROCK A55 Pro3 Manual Del Usuario página 190

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 thru this link:
http://support.microsoft.com/kb/2505454/
B. After installing Windows
(This may take long time; >30 mins.)
C. Reboot your system. (It may take about 5 mins to boot.)
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D. The Windows
E. Please start to install motherboard drivers and utilities.
17. Finish.
190
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7 64-bit, install the hotfi x kb2505454.
will install this hotfi x then reboot by itself.
ASRock A55 Pro3 Motherboard