Sudden computer lag

So... Recently I've been getting some strange lag, where my mouse suddenly lags across my monitor, and all my games run between 5-20FPS on low settings. It wasn't really much until a few days ago, and that is when I decided to try some things.
Here is a list of what I tried:

Close Background Programs
Antivirus scans
Update Drivers
Temp file deletes
Use CCleaner to clean out junk files
Deleted useless programs (Games I no longer play)
And clean the dust out of my PC (There was a lot.)

After all that, my computer seems to have gotten worse, and most games (like Rainbow Six Siege) are near unplayable on the lowest settings, when I used to play them on max with ease.

Here are some basic computer specs (That I remember.):
650W PSU
1060 6GB GIGABYTE NVIDIA GPU (Forget the exact model name)
Intel i7-4790 @ 3.6GHz CPU
32GB of ram... Forget what type though.
Windows 10 Home 64-bit OS

Anyone able to help with this?
Thanks again.

Post was last edited on March 16, 2018 6:39 PM PDT

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Clarification Request
Did you make sure to disable driver updates?

I've never seen a 1060GB RAM video card. My bet is you meant the Nvidia 1060 line.

Remember I have seen a lot of complaints on this. The usual find is the owner didn't know to disable Windows 10 Driver updates. We disable that and repeat installing the drivers we used before for video, motherboard, sound and so on.

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Haven't tried that yet

Ah, sheesh, whoops! I meant 1060 6GB, but must not have noticed the mistake.

And I actually have not tried that yet, so I'll get to it and see how it goes I suppose.

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If that does not work for you

Grab a copy of malwarebytes and also hitman pro.

Run a scan with each just to see if they pop up something.

Grab some temp monitor prog and watch your cpu and gpu temps.

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Answer found

So after a week of being brought down to the professionals (hence the idling), I have now figured out why my PC has suddenly messed up. According to the technicians, something on my motherboard short-circuited, causing it to not work properly.

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I'd be suspicious of that diagnosis

Did they fix it? If so, what did they do? I'd ask them to tell me exactly where this "short circuit" was found. I could understand an overheating condition causing a poor solder connection to crack. Hence, an open and not a short. As a test to see if they were correct, I'd boot a live Linux disk and run a bunch of graphics intensive applications or videos to see if I could duplicate the problem. A short circuit wouldn't care what OS was running. It would respond in the same way.

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