Windows 10

I'm running a seemingly normal Win10 system with updated drivers, both through standard Windows Updater and manual patching if a new driver is available.

The Dell logo flashes multiple times per boot.
There is always a long freeze every boot.
Computer is running standard programs poorly.
Webshells of websites are now the standard.
Files being remotely deleted, edited, etc.
Power killswitch

reinstalling the OS does nothing.

How do I delouse my machine?

Win10 Home - 10.19044 Build 19044
CPU: i5-8300H
System Dell G3 3779
SMBIOS Ver. 0886
Bios Ver. 1.18.0 9/22/2021
GPU: GTX1060M
RAM: 16Gb