Hi, and thanks for reaching out. My name is Bernard a Windows fan like you. I'll be happy to help you out today.
I understand the issue you have, there is nothing to worry I am here to help, have you noticed any changes before the issue starts? or have you installed any apps or programs that may cause the issue? and just to confirm you cannot navigate the PC at all? or can you still use it for a short time?
While waiting for your response, if you cannot use the PC at all, first, we need to go to Windows recovery mode and try the options there:
Restart the device 3-5 times until I reach Windows recovery mode, wherein you have the option to select Continue, Troubleshoot, or Exit.
Or try to Press and hold the Shift key while continuously pressing F8 while starting the PC
Then on Windows Recovery:
Do system Restore:
Click Troubleshoot> Advanced options> System restore - Follow the prompt and choose the date when it was working fine.
Let me know how it goes and I hope that helps.
Bernard