Unified Extensible Firmware Interface (UEFI ) is the successor to that, and UEFI can support remote diagnostics and repair of computers, even with no operating system installed
You can get a USB optical drive for under 25.00
Your problem however, may be with memory or the motherboard. Create or buy a Linux live copy, which you can run off a USB flash drive by which you should be able to see Windows files. However, uness you use Knoppix or Puppy Linux buy on USB if you want may not allow you to edit files therein.
Lol.. I didn’t think anyone else remembered Puppy Linux :D