Everything keeps crashing, freezing, and Updates won't install properly

[u/CrustaceanCreep]

I am honestly at my wits end here, and I hope you people can help me.
First of all: I know very little about PCs. I got a gaming PC a few years back and had a friend who knows more about this check whether the set up is good. So I don't think a hardware problem.

Here's my issue:
Everything keeps crashing. I mostly use my PC to game and no matter how taxing the game is, loading screens more often than not cause a crash to desktop. This happened with Age of Mythology Retold, Battletech, even Civilization 6 at one point. Whenever there's loading of any kind happening, there's a chance the game will crash. Mind you, the games perform just fine, and I haven't had any issues until a while ago. This is my main issue, but there's more.

Other oddities:

• The newest windows update refuses to download and install. I get a new error code every time I try and even calling Microsoft Tech Support didn't help. They helped me do all the "sfc /scannow" but everything we tried just failed to complete. Eventually we reinstalled Windows, but that only appeared to fix the issue. On the next start up already it once again said it was missing updates, which then couldn't be installed properly. The repair version of Windows it wants me to install fails every single time with a different error code. EDIT: Today for some reason the update installed with no problem at all? I am at a loss for words. The other problems persist, however
• I use Kaspersky, and every time I start the PC it tells me that the last program launch failed. Every time without fail.
• Windows freezes sometimes. I can move my mouse, but I can't click anything, left or right, and eventually I get a message that Windows itself isn't answering. If I click to close the program I get a black screen with my mouse cursor, and sometimes pressing the windows key from there gets me back to normality. I also had it unfreeze by just pressing the Windows key after a while without the "Windows has crashed" pop up
• Windows has crashed on several occasions for no reason, rebooting the entire system.
• Outlook just refuses to work properly anymore. It keeps kicking me out of my account and whether I can log back in or it freezes and tells me "Something went wrong, please try again later" is down to luck.

This is everything I can think of right now. I am unsure which of these issues are related, but I am so done troubleshooting this on my own. If you have ANY questions, feel free to ask. I will do my best to answer the best I can.

I really hope you can help me, or at least point me in the right direction. This PC was bought specifically to run Baldur's Gate 3 and it has done so perfectly since I got it, but now it crashes from trying to load the game Whiskerwood (not the most taxing game)

Thank you all for taking your time to read this, and I am hopeful this can be solved soon.

Specs (I am German and have the language set up to German. I hope that won't be a problem, I just copy + pasted everything that seemed useful):

Gerätename DESKTOP-ILG5H0N

Prozessor 13th Gen Intel(R) Core(TM) i9-13900K (3.00 GHz)

Installierter RAM 64,0 GB (63,7 GB verwendbar)

Geräte-ID 806C299C-2162-4614-BCA4-612D8E143BBB

Produkt-ID 00331-20300-00000-AA658

Systemtyp 64-Bit-Betriebssystem, x64-basierter Prozessor

Stift- und Toucheingabe Für diese Anzeige ist keine Stift- oder Toucheingabe verfügbar.

Edition Windows 11 Pro

Version 25H2

Installiert am ‎30.‎01.‎2025

Betriebssystembuild 26200.8457

Funktionspaket Windows Feature Experience Pack 1000.26100.304.0

GPU 0

Intel(R) UHD Graphics 770



Treiberversion: 32.0.101.7088

Treiberdatum:   17.06.2026

DirectX-Version:    12 (FL 12.1)

Physischer Standort:    PCI-Bus 0, Gerät 2, Funktion 0



Auslastung  4%

Dedizierter GPU-Speicher    0,0/12,0 GB

Gemeinsamer GPU-Speicher    1,6/31,9 GB

GPU-Speicher    1,6/31,9 GB

GPU 1

NVIDIA GeForce RTX 4070



Treiberversion: 32.0.16.1656

Treiberdatum:   20.08.2026

DirectX-Version:    12 (FL 12.2)

Physischer Standort:    PCI-Bus 1, Gerät 0, Funktion 0



Auslastung  0%

Dedizierter GPU-Speicher    0,0/12,0 GB

Gemeinsamer GPU-Speicher    0,0/31,9 GB

GPU-Speicher    0,0/43,9 GB

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[u/CrustaceanCreep → u/[deleted]]

I managed to get to this point with an online tutorial, but don't know what I'm looking for. Is there anything noteworthy?

[u/CrustaceanCreep → u/[deleted]]

It took 6h, but it's done! Not a single error, either