I wish I knew more about computers.

I'm at my wits end now, I don't know what it can be. Dr Google just tells me the same things over and over and I've done all of them now, yet the issue still remains. My brother can't figure it out and he's better with computers than I am and I don't exactly have a techy friend who can have a look. The repair guy my mother hired just reinstalled all my damn drivers again and called it fixed.

To put it as best as I can, my computer keeps randomly stuttering, like I'll move the mouse and it'll visually freeze for a split second. The audio and visual both do this at the same time and sometimes it'll go into a state where it won't load anything at all. Best way I can think of explaining it is imagine playing a video game that just drops down to 2fps randomly every now and then.

Drivers are all up to date, I did this before the asshole did it again. To make one hundred percent sure of this because I was sick of people telling me this is what it was, I uninstalled and reinstalled them all manually.

Hard drive is nowhere near full, I've only used about 6% of the space on it. I'm now looking at SSDs because brother thinks I should.

RAM has just been upgraded to 16GB. It ran smoothly yesterday but today the stuttering has returned, a lot less frequent but still happening.

Brother thought it might be the motherboard getting too hot because the thermal paste on the cooling bit has worn out so we replaced that, but it's done nothing to help.

There's no malware or virus causing it. Manual Defrag wielded no results either. Task Manager shows that I'm not using a high amount of memory or CPU so it's not them spiking. The only thing I haven't tried yet is completely wiping the system, this will be my next port of call if I can't get this figured out. Everything is backed up anyway so I lose nothing but time by doing this, learned that mistake when my original laptop self destructed and I lost everything.

I just wanna vibe with friends and play video games with them or listen to music and write stories without it sounding like my shits buffering all the time.

Edit - I do appreciate you giving me ideas and such, honestly I was just ranting and expected this to vanish into the void. I was asked to put the specs in here so hopefully this is the right stuff, but I don't wanna hear any "Your system is crap" I know she is. She was a cheap buy because I'm hekkin poor and just wanted to be able to do stuff with friends, I can't afford to get a new system which is why I'm just making do with what I have. I'm also not massively tech savvy, I know a bit more than the regular joe but I don't know most of what you guys are saying ^^'

Processor - AMD A10-9700 RADEON R7, 10 COMPUTE CORES 4C+6G 3.50 GHz
Installed RAM - 16.0 GB DDR4
System type - 64-bit operating system, x64-based processor
Storage - 2TBHDD