Hi,
Thank you for coming Microsoft Q&A forum.
I noticed load optimal defaults will not affect your system disk, but you need to familiar with BIOS and back it up, in case some actions such as if you changed the hard disk controller before resetting the BIOS, you will need to restore the correct value by change the mode of the hard disk controller. Otherwise, a STOP blue screen will be displayed each time Windows starts.
As BIOS is not a part of system, and also out of Microsoft support scope. We recommend to contact with Acer support might need to pay for support if your device out of quality assurance.
Bests,
Joy.
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