For whatever reason, my current keyboard will only work to enter the BIOS on a fresh boot...and only some of the time. If I reboot to enter the BIOS, I can't press any keys and therefore can't, making any kind of overclocking extremely inconvenient.
Naturally, I want to install Intel XTU. I used it on my previous machine (actually just a different motherboard), and it worked fairly well, but it's completely failing me now. My current configuration is an i7-2600K, installed in a D77GA-70K, running Windows 10 Pro. This is one of Intel's own boards, from their Extreme product line, so it seems strange that XTU would have issues here.
I attempted to install the latest version, without success. I could change the power limits, but nothing else. I tried manually installing the drivers in the folder, which changed nothing. I tried installing multiple older versions from your library and manually poking at their drivers, none of which worked - even the ones specifically marked as compatible with Sandy Bridge.
The only clue I have is the error message given when I try to install the driver I believe is the culprit: iocbios2.sys, or the "IntelĀ® Overclocking Device Driver". Every other driver or prerequisite seems to install okay, even if I have to force it, but that one fails every time. Using the in-folder installer and the INF both say they succeed even though they don't.
My last resort, which was trying to add the OC driver manually to Device Manager results in this cryptic error, which appears to be some sort of stock fallback that's been in NT-based Windows for ages: "The installation failed because a function driver was not specified." This is clear as mud, and Google wasn't much help - it seems to cover for all kinds of issues that don't seem to have much with the error itself.
I hope this is enough information! If anyone has any ideas what might be happening, let me know.