My PC wasn't booting up properly for some reason. Perhaps my SSD got corrupted but I tried to reinstall it from Windows 10 media creation tool and it was not working so I reformatted my HDD and SSD thinking that would work. Still nothing. I unplugged my memory stick and plugged in my external CD Drive to install Windows 8 Retail edition from the CD. Still wouldn't work and I get a strange error message saying that the USB memory stick is still plugged in even though I have disconnected it and it won't show up in the BIOS. how can i fix this to do a clean install of windows?