Windows Defender offline from USB fail to update

Hello,

As is have a virus that comes with a screen from the moment my pc starts, so i can't do anything.

I have been told to use Windows Defender offline to remove it.

As is followed the instructions , i have now a bootable usb of windows offline defender,

but everytime i try to boot from usb , all goes well , but i can't do a scan because 'Windows defender Offline requires up-to-date virus and spyware definitions. You'll need to install the latest definition updates before scanning your pc.

But when i click on 'update' , i receive an error :

Virus and spyware definitions update failed , check your internet of network connection and try again.

error code 0x80072ee7

My endproject of school is on that computer so i need it very quick ..

Can anyone help me pls ?

greets

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