PC is 4 or 5 years old. Never heard of flashing the BIOS, but it sounds like good advice.
If it is only 4-5 years old, you shouldn’t have a problem (it should already be able to boot from Flash-drive (USB)).
Normally, if a person isn’t having issues with the PC itself, you shouldn’t attempt to flash your BIOS unless you are comfy doing so (but it isn’t that hard, and there are walk-throughs available how to do it.. it would only take a maximum of, maybe 5 minutes).
Nothing beats “Ghost” for backup/clone for Windows for Mac use Carbon Copy Cloner.