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The Intel site is being updated and many links may not yet function properly.
You can get the IDU from here: Download Intel® Desktop Utilities
The IDU does not provide any control for overclocking.
You can get the XTU from here: Download Intel® Extreme Tuning Utility (Intel® XTU)
It seems a compatibility issue between board and the operating system. Windows® 8, 8.1 and 10 are newer operating systems and drivers available belong to Windows® XP, Vista, 7.
I recommend you to download the latest drivers manually from the link below.