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Can't repair PC, can't re-install Win10, stuck with viruses.
I bought an iView cyber pc with Windows 8.1
Windows upgrade to 10
virus attack, mysterious bank charges, popups etc. Couldn't use PC.
so I used the Windows 10 USB boot disk and select to repair the PC, tried deleting all files, tried leaving files. Neither option works it says there's an error restoring the PC.
I tried fresh install (Microsoft didn't supply a product key so I used Magical Jellybean to obtain the product key for Win10)
in the Windows 10 Install USB I enter the product key, it says it's invalid and doesn't match any products.
tried to repair the virus issue with Malwarebytes but now PC won't load windows 10.
so I'm not sure what to do, I can't repair, can't refresh install, can't clean install, can't use my PC as it is infected with viruses. I can't install windows 7 that I have because it won't boot since it's legacy bios OS and the PC is only UEFI.
but also I've installed the Windows 7 on virtual machines before knowing the key can only be used so many times, so it won't let me anyways I'm sure. (even though it was only virtual machines running on my main Win7 pc)
anyways. Any advice would be great, I don't know what to do! It would have been helpful if Windows made a backup post-install of Windows 10 but it didn't. or if Microsoft provided a key to the email address I registered for an upgrade to 10, but they didn't
thanks in advance!