Hi Georgie,
I am Dave, I will help you with this.
Rest assured, you can re-install Windows at any time, and that is the best way to fix a system with many problems, you will end up with a responsive and stable system.
Re-installing Windows will not affect on your BIOS, and the installation process will install a clean set of device drivers, if there are any drivers not automatically installed during the installation, you can get any drivers you need from the support page for your laptop on the Asus website on this link:
https://www.acer.com/us-en/support?search=AN515...
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