Will installing Windows via ISO file completely delete my previous system?

Right now I have an unofficial, terribly shaky Windows with many wrongs. It was installed on my PC in the service centre(as it happens in my country). I need to delete this garbage from my PC and install an official one.
Why via ISO file and not USB? I cannot install Windows via USB because I can't choose the boot menu using the Enter key. BIOS instructions say: to choose menu press Enter, I press it and my desktop opens instead. Every time. It doesn't make sense.
So!
Will installing via ISO file delete my previous system without any loose ends(no remaining data, drivers, bits, anything)?

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Answer
Answer
Are you able to get into BIOS by repeatedly pressing the F2 key on startup or get a temporary boot menu by pressing the F8 key?
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Last updated May 13, 2024 Views 54 Applies to: