Keyboard Isn't Working

So I installed Windows 10 and my keyboard has been rendered useless. I chose to jump the queue as it were (rather than wait for the on-screen notification) - not sure if that's relevant. The keyboard is made my a Chinese company called E-Elements. It's a mechanical keyboard with RGB lighting URL...

The RGB lighting works perfectly fine (but then it would because it's just being powered via USB) - the problem is that none of the keys are working. The NUM LOCK and CAPS LOCK LED indicator also isn't working. I tried a different keyboard (non-mechanical) and that works fine, so thought the keyboard itself was the issue. I then plugged it into my PS4 and it works fine. I then booted my PC in BIOS and weirdly it also works fine in BIOS, so it's definitely an issue with the keyboard communicating with W10 or W10 communicating with the keyboard.

Another thing I should probably mention is that when I installed W10, I didn't do a clean install, I chose to keep my files and settings. I have since, however, reinstalled W10 as a clean install as I had backed everything up anyway - it still didn't work. Somebody suggested simply reverting back to W7, but I have now lost that option since I have reinstalled W10 a second time.

I have also checked Device Manager for any USB devices with an exclamation mark, and reinstalled several drivers. Weirdly, the device manager does actually recognise it as a keyboard.