Problems Galore on Windows 10.

I couldn't find a thread with the problem, So I made a new one. I had Windows 10 Pro, Build 1809. My accounts had a problem, and I couldn't log in. I popped in a new disc which is the one I had just burned a disk image to. Went through the installation. I realized that It wasn't the newest version of Windows. I tried updating it. At about 81% through the Blue Update Screen, It crashed. Same problem I had. So, I decided to say F*** it. I kept the version, and tried to make the best of it. (This PC is now running 1511) Now, Here comes the UAC thing. Yes, I could press Yes. That wasn't a problem. The problem was that when I clicked yes, The UAC thing would go away, But It would still be on it. (Refer to picture) If I waited a bit, It would go away. But yet It wouldn't do the action that prompted the UAC in the first place. This means that I can't open CMD as administrator, Change my account type, or anything that requires an UAC prompt to run. I think that it may be a Hard Drive issue, As the PC was made in 2011, I just upgraded it. Specs are below.

Gateway DX4860-UB32P Desktop (2011)
Intel Core i3 @3.3GHz
6GB DDR3 RAM
Acer Motherboard
Western Digital 1TB HDD
Gigabyte GeForce GTX 1050ti (4GB)

Help would be greatly appreciated. Thanks!

iSamurx (Gavin)

Thanks, Ken!
I just have a question. When I do install the OS, Should I delete the Partitions that already existed, (Expect, of course, the system reservered) Or should I delete that too?

Thanks,
iSamurx (Gavin)

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Okay, That was a grammar fail. *reinstall *except. Probably more wrong.

With a clean boot it's better to delete all partitions and let windows create what it needs. Before 1903 updates were sent to prepare for it not getting those may have been your problem