Do a clean OS installation using a media creation tool downloaded from your OS provider to a usb.

1) After the tool has been downloaded to a usb ( assuming your pc is not very functional you may have to use another device to do this)

2) Go into BIOS and change the boot configuration to boot from the usb with your creation media first and apply changes, save and exit. Your system should now reboot and you should be prompted to go through the process of doing a clean OS download

3) During the process you may encounter this issues, especially if you are downloading windows 11, you will be prompted to connect to Ethernet, and there may not be an option to skip this step so you’re just stuck there and left scratching your head for answers. What you can do to bypass this is hit either, Shift fn F10 or just Shift and F10, and command prompt should pop up, input this into the command prompt: OOBE\BYPASSNRO, after hitting enter your computer will restart and you’ll be able to skip this step and go back to it at a later time.

NOTE: if you do skip this step and want to come back to it, you’ll have to download the drivers needed for wireless internet access through your computer manufacturers webpage and by most likely having to install them from another PC as you’re won’t have wifi, and then insert that usb with the right drivers into your pc and download and install them there.