I can access my BIOS, but Windows won't boot (not even in safe mode). I also cannot repair or reinstall my OS. It reaches the 'Windows is preparing to install' step and never actually does anything. Any suggestions?
When you loaded the new BIOS, it most likely reset your motherboard back to default configurations, and if your primary boot drive isn't on SATA-0, you will need to point the BIOS so that your primary boot drive is the first that it looks for.