Many Serious Problems & Pain (Windows 10 / Games / Software)

Hello!

A couple weeks ago I was preparing, cleaning 2-3TB of junk, backing up data, etc. for reinstalling the OS. Clean install of Windows 10, I should say.
I was using Win 7 for maybe 6-7+ years until now. And so a couple days ago I began the downloading, setting up, installing and configuring processes. This didn't took that much time and effort of course, because I've done it maybe dozens of times in the past.

Anyway, after I finished my usual basic "installation routine" (configuring the appearance, tweaking some things, sorting things up in the start menu, etc.) I wasn't even done with the drivers installation and I ran into problems...

I basically know that Win 10 is not for me overall. I am sort of "very advanced" user, I care about even the tiniest thing if it comes to gaming, software, recording, streaming and so on. Also just no one wants to know what problems and things I went through in the past and currently I'm fighting with.

So firstly I encountered issues with the permissions, accounts, etc. Somehow I wasn't able to access any OS related file, setting, even the Control Panel categories were locked up and glitched. Then I just told myself to throw everything away, do a format and reinstall again.

No problems. 10-15 minutes later I was configuring and tweaking again things, also I had installed all the necessary MB, Chipset, Nvidia & Audio drivers. I began installing all the software and programs I need and also Steam (to start downloading the games sooner).

Then again a couple problems popped up from nothing. Some of them were related to the display formats (date, time, clock) changing the language, keyboard layout, while others were completely different.
Serious audio problems - OBS Studio, Discord, Steam were not detecting signal from the mic, tried many audio adapters, 3.5mm jacks, cables. Reinstalled couple versions of the Audio Drivers - No success.

After hours troubleshooting "magically" the issues were gone / fixed somehow. No any trace of the things that were happening earlier.
After all of this suddenly my browser (Chrome) started opening Microsoft homepage at every PC Shutdown / Restart. No matter what I've googled and tried this strange thing has not been fixed yet.

So, more problems related to completely different places. Disk Cleanup function not working correctly, Start Menu search totaly broken (cannot find any installed application, program, software, game), Applications crashing / not starting, Windows Features (Such as Framework 3.5, etc.) hanging up while enabling / installing and a ton of such things more...

Currently the situation is getting worse...

Sometimes I get notifications popping up about Audio Devices and the Realtek Audio Manager app opening itself. (Thoroughly checked and tested all the cables, audio jacks, mic, headphones - No sign of any malfunction or problem).

But the biggest issue here is something completetly different again.

I have extremely high and unstable DPC Latency and Interrupt-To-Process Latency.
Screenshots and report from DPC Latency Checker and LatencyMon 6.51:

- DPC Latency Checker (Started from 1-2m)
- LatencyMon #1
- LatencyMon #2

- LatencyMon Report

I don't know if DirectX / Kernel Drivers can lead to such serious issues. Very few games utilize DirectX 12, but that is not reason not to use Windows 10, but other Operating System.

This is just terrifying... I can't re-install OS couple times at day while wasting days and weeks of time just by testing, troubleshooting things without any success...

And also on top of that there is big issue with games, especially CS:GO. I almost never had problems or issues with it, but...

The FPS limiter (which is 300 by default) is not working correctly. The game can't reach the maximum framerate even at empty map with the lowest graphics possible. (GPU Usage: 30-40% / CPU Usage: 20-30%)

Before (With the old OS - Win 7) the framerate will snap immediately to 299, sometimes the full expected 300 (Which I think is the Source Engine counting 1 frame less). I had 250+ FPS almost everywhere, even in full servers on the heaviest maps, maximum settings, etc.

CS:GO is not so GPU intensive game, but even the CPU never caused absolutely any issues or something. It's not hardware problem, it's not problem in the game itself or something similar...

Now I can barely reach 250-300FPS on the lightest maps, somethimes there is "jump" to around 400FPS (for 100-200 milliseconds, almost impossible to see).
Not to mention the enormous input lag and stuttering, together with the rest of the problems and headaches...

Just for some extra information:

- Tried couple reinstalls 1-2 days ago;

- Full, clean reinstall of the Audio Drivers (Different versions from the official MB Manufacturer's website and also from the Audio Chip's Manufacturer - Realtek);

- Full reinstall (Using DDU under Safe Mode) of NVIDIA Drivers (Tried couple stable version behind);

- Re-searching, checking everywhere and trying fixes, tweaks, etc. for the problems;

- Thoroughly checking and testing the hardware / peripherals;

- Playing with HPET (High Precision Event Timer) Settings in the BIOS and also in the OS (A long time ago fixed couple issues of mine and helped a lot of other people);

- Trying and testing dozens of settings (Nvidia CP, Nvidia Inspector, etc.);

- Updating the BIOS to the latest version (couple days ago) and even overclocking the CPU & GPU (A little performance improvement, but none of the problems fixed);

- Disconnecting and using only the needed peripheral devices (tested couple keyboards, mouses, disconnecting the second monitor, connecting old TV for testing);

- Probably more things I have forgotten that I've tested and tried...


This is a whole novel and for those who read it definetly deserve a reward.

Bay the way I'm sorry for my terrible English sometimes, this took "a lot" to write.

I will appreciate any help, opinion, suggestion, because I've tried and I can't do basically anything more in that situation...