I neither can install wsl nor update .

[amrupak]

C:\Windows\System32>wsl --install
Class not registered
Error code: Wsl/CallMsi/Install/REGDB_E_CLASSNOTREG

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🔥 YES — this 100% confirms that WSL is not installed, and more importantly:
❗ Your Windows Installer (MSI) and WSL COM components are broken.

That specific error:

Class not registered
Wsl/CallMsi/Install/REGDB_E_CLASSNOTREG

means:

🚫 WSL is not installed
🚫 WSL cannot install
🚫 WSL cannot be repaired through commands
🚫 MSI installer engine is broken
🚫 COM registration is broken
🚫 Required system DLLs are missing

This error is not about WSL itself — it means Windows cannot run or load the WSL MSI installer at all.

⚠️ Why this error happens

You already discovered:

❌ appmgmts.dll missing
❌ findstr.exe missing from PowerShell
❌ regsvr32 failing to load some modules
❌ MSI installer failed “Ended Prematurely”
❌ DISM logs show invalid packages
❌ PowerShell environment partially broken

All of these come from Windows Component Store corruption (WinSxS).

WSL IS NOT INSTALLED, and Windows cannot install it until the OS is repaired.

⭐ So what does this mean for you?

Your Windows is missing core components required for WSL installation.
No command will fix this — not wsl --install, not DISM alone, not SFC, not regsvr32.

🚨 Only a Windows Repair using the ISO can fix your system.

You already downloaded the ISO.
Now you simply need to run the repair.

✅ DO THIS NOW (THE FIX): Windows Repair Installation

This repairs:

✔ WSL components
✔ MSI installer engine
✔ Missing system DLLs
✔ Component Store
✔ Broken PowerShell environment
✔ COM registration
✔ DISM failures

1️⃣ Mount the ISO

Right-click → Mount

Is this the only way to fix this issue??

[Dev4YM]

Yes, the solution u provided is the solution for this, and the only i think, bcs i faced THE SAME issue and windows itself said to me the only thing is to Repair Windows.

BUT make sure if u want to u save files and apps and settings by checking an option in the new installation. here's detailed steps i got from microsoft support:

You already have the ISO (make sure its the latest), so start from here:

1. You need to open that ISO folder and search for "Setup" in that folder. Now do right click on "Setup" and run this file as administrator.
2. Now, there will be a pop-up you have to allow you system to execute this file.
3. After this you’ll see that setup is preparing itself to start:
4. Then in the following window so appears, make your choice. If you don’t have Internet connection, pick Not right now and click Next:
5. Moving on, accept the license agreement from Microsoft by clicking Accept.
6. So the setup is near to install the upgrade. Click on the Change what to keep link here to choose which things to delete while upgrade:
   Best option here is to select Keep personal files, apps and Windows settings. Click Next and then click Install in above shown window.
7. Finally, the installation starts and get completes in few minutes. Your PC will restart after the installation is over.
8. After reboot, you will see the Upgrading Windows. Here there are three sections and after completing each section, PC will restart. When this screen reaches to 100%, system will finally reboot.

I advice u if u have any issues for WSL, then report it here:
https://github.com/microsoft/WSL/issues

so it be categorized as an issue, and u get help faster.