1
If you are unable to get into Windows
Are you able to force your PC into the Recovery Environment using these steps.
Start your PC, just as Windows attempts to load (spinning dots), press and hold Power Button for 5 - 10 seconds to perform a Hard Shut Down
Do this twice
On the third start Windows will boot into the Recovery Environment and from there you can access System Repair, Safe Mode, Command Prompt... etc.
2
If you are able to get into Windows:
Please check to see if your PC is producing any minidump files, I will check those to see if they provide any insight into a potential cause of the system crashes.
Please do not upload a very large Memory.dmp file.
Open Windows File Explorer.
Navigate to C:\Windows\Minidump
Copy any minidump files onto your Desktop, then zip those up.
Upload the zip file to the Cloud (OneDrive... etc.), then choose to share those and get a share link.
Then post the link here to the zip file, so I can take a look for you