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Windows 10 should have converted the key to a Windows 10 key and when you reinstall with the Windows 10 media it will pick up the key and activate just fine. I haven't done it that way before though so hopefully someone else can chime in to confirm.

Deleting the registry entry may solve that issue, but there may be more than that one entry. Have you tried using AdwCleaner?
https://toolslib.net/downloads/viewdownload/1-adwcleaner/
I suggest you try this first, it's very good at finding adware that antivirus programs overlook. If it fails to solve your problem you could try deleting the registry entry.

Change the motherboard unless you reallly want it. You can save a lot there IMO.
 
 
 
 
I agree here. You could save $100 bucks on the mobo, and either invest more into a CPU or GPU. You could use that 100 towards a 4790k, or towards a 980, however the 980 will be a great deal more expensive, more than 100 more. Other than that, your build is looking pretty fancy!

Change the motherboard.

You wanna save money? Drop the Maximus for something cheaper ROG stuff is generally pretty overpriced 

The motherboard is a tad spendy to pair with a 4690k.
If you want to keep the black and red, I would recommend this.
With that savings, you could perhaps drop a little bit more money on the rig and get a 980.

Well, I've have enough time to install at least the required drivers (such as video drivers etc.) and so far everything seems to be fixed, and the system loads much faster as well as being much more responsive!
 
Thanks for all the help guys, greatly appreciated

Well, I've have enough time to install at least the required drivers (such as video drivers etc.) and so far everything seems to be fixed, and the system loads much faster as well as being much more responsive!
 
Thanks for all the help guys, greatly appreciated

Yeah figued it out thanks, and I have some crappy proprietary dell mobo since this machine was prebuilt but it was easy enough to find once in the bios. Had a few rookie hiccups but I figured out what I was doing wrong through trial and error. On the last step of installing now so I'll update once I'm actually able to use my PC again.