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Reinstalling Windows 10: How to be sure all malware is erased?

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Malwarebytes detected a trojan on my PC which has been removed (or at least scans no longer show it). To be safe, I want to reinstall windows from a USB, and I want to be sure all malware is erased.

Will it be enough to just delete the drive partitions when the menu comes up after booting from the USB - will that get rid of all malware? Or, do I need to erase the data on the drives another way? I see people mentioning CCleaner and DBAN but then others say this is unnecessary. Then others say rootkits can hide in hidden partitions and the bios. I am yet to find a definitive answer. Also, in case it matters, I have an SSD and a HDD.

TLDR: Can I just boot from the USB installation media then delete drive partitions when that menu comes up - will that delete all malware? Or do I need to use another method to wipe the drives. For reference, I have an SSD and HDD and need to clean both.

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  • 5 weeks later...
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